Hit test on the layer tree rather than the RSLL

R=danakj@chromium.org,enne@chromium.org
BUG=369757,368935

Review URL: https://codereview.chromium.org/266913021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269835 0039d316-1c4b-4281-b951-d872f2087c98

8 files changed, 2313 insertions, 2398 deletions

diff --git a/cc/trees/layer_tree_host_common.cc b/cc/trees/layer_tree_host_common.cc
index 8a5a552..a9af3ef 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -16,7 +16,6 @@
 #include "cc/layers/render_surface_impl.h"
 #include "cc/trees/layer_sorter.h"
 #include "cc/trees/layer_tree_impl.h"
-#include "ui/gfx/point_conversions.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/transform.h"
 
@@ -2427,220 +2426,4 @@ void LayerTreeHostCommon::CalculateDrawProperties(
   DCHECK(inputs->root_layer->render_surface());
 }
 
-static bool PointHitsRect(
-    const gfx::PointF& screen_space_point,
-    const gfx::Transform& local_space_to_screen_space_transform,
-    const gfx::RectF& local_space_rect) {
-  // If the transform is not invertible, then assume that this point doesn't hit
-  // this rect.
-  gfx::Transform inverse_local_space_to_screen_space(
-      gfx::Transform::kSkipInitialization);
-  if (!local_space_to_screen_space_transform.GetInverse(
-          &inverse_local_space_to_screen_space))
-    return false;
-
-  // Transform the hit test point from screen space to the local space of the
-  // given rect.
-  bool clipped = false;
-  gfx::PointF hit_test_point_in_local_space = MathUtil::ProjectPoint(
-      inverse_local_space_to_screen_space, screen_space_point, &clipped);
-
-  // If ProjectPoint could not project to a valid value, then we assume that
-  // this point doesn't hit this rect.
-  if (clipped)
-    return false;
-
-  return local_space_rect.Contains(hit_test_point_in_local_space);
-}
-
-static bool PointHitsRegion(const gfx::PointF& screen_space_point,
-                            const gfx::Transform& screen_space_transform,
-                            const Region& layer_space_region,
-                            float layer_content_scale_x,
-                            float layer_content_scale_y) {
-  // If the transform is not invertible, then assume that this point doesn't hit
-  // this region.
-  gfx::Transform inverse_screen_space_transform(
-      gfx::Transform::kSkipInitialization);
-  if (!screen_space_transform.GetInverse(&inverse_screen_space_transform))
-    return false;
-
-  // Transform the hit test point from screen space to the local space of the
-  // given region.
-  bool clipped = false;
-  gfx::PointF hit_test_point_in_content_space = MathUtil::ProjectPoint(
-      inverse_screen_space_transform, screen_space_point, &clipped);
-  gfx::PointF hit_test_point_in_layer_space =
-      gfx::ScalePoint(hit_test_point_in_content_space,
-                      1.f / layer_content_scale_x,
-                      1.f / layer_content_scale_y);
-
-  // If ProjectPoint could not project to a valid value, then we assume that
-  // this point doesn't hit this region.
-  if (clipped)
-    return false;
-
-  return layer_space_region.Contains(
-      gfx::ToRoundedPoint(hit_test_point_in_layer_space));
-}
-
-static bool PointIsClippedBySurfaceOrClipRect(
-    const gfx::PointF& screen_space_point,
-    LayerImpl* layer) {
-  LayerImpl* current_layer = layer;
-
-  // Walk up the layer tree and hit-test any render_surfaces and any layer
-  // clip rects that are active.
-  while (current_layer) {
-    if (current_layer->render_surface() &&
-        !PointHitsRect(
-            screen_space_point,
-            current_layer->render_surface()->screen_space_transform(),
-            current_layer->render_surface()->content_rect()))
-      return true;
-
-    // Note that drawable content rects are actually in target surface space, so
-    // the transform we have to provide is the target surface's
-    // screen_space_transform.
-    LayerImpl* render_target = current_layer->render_target();
-    if (LayerClipsSubtree(current_layer) &&
-        !PointHitsRect(
-            screen_space_point,
-            render_target->render_surface()->screen_space_transform(),
-            current_layer->drawable_content_rect()))
-      return true;
-
-    current_layer = current_layer->parent();
-  }
-
-  // If we have finished walking all ancestors without having already exited,
-  // then the point is not clipped by any ancestors.
-  return false;
-}
-
-static bool PointHitsLayer(LayerImpl* layer,
-                           const gfx::PointF& screen_space_point) {
-  gfx::RectF content_rect(layer->content_bounds());
-  if (!PointHitsRect(
-          screen_space_point, layer->screen_space_transform(), content_rect))
-    return false;
-
-  // At this point, we think the point does hit the layer, but we need to walk
-  // up the parents to ensure that the layer was not clipped in such a way
-  // that the hit point actually should not hit the layer.
-  if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer))
-    return false;
-
-  // Skip the HUD layer.
-  if (layer == layer->layer_tree_impl()->hud_layer())
-    return false;
-
-  return true;
-}
-
-LayerImpl* LayerTreeHostCommon::FindFirstScrollingLayerThatIsHitByPoint(
-    const gfx::PointF& screen_space_point,
-    const LayerImplList& render_surface_layer_list) {
-  typedef LayerIterator<LayerImpl> LayerIteratorType;
-  LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list);
-  for (LayerIteratorType it =
-           LayerIteratorType::Begin(&render_surface_layer_list);
-       it != end;
-       ++it) {
-    // We don't want to consider render_surfaces for hit testing.
-    if (!it.represents_itself())
-      continue;
-
-    LayerImpl* current_layer = (*it);
-    if (!PointHitsLayer(current_layer, screen_space_point))
-      continue;
-
-    if (current_layer->scrollable())
-      return current_layer;
-  }
-
-  return NULL;
-}
-
-LayerImpl* LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-    const gfx::PointF& screen_space_point,
-    const LayerImplList& render_surface_layer_list) {
-  LayerImpl* found_layer = NULL;
-
-  typedef LayerIterator<LayerImpl> LayerIteratorType;
-  LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list);
-  for (LayerIteratorType
-           it = LayerIteratorType::Begin(&render_surface_layer_list);
-       it != end;
-       ++it) {
-    // We don't want to consider render_surfaces for hit testing.
-    if (!it.represents_itself())
-      continue;
-
-    LayerImpl* current_layer = (*it);
-    if (!PointHitsLayer(current_layer, screen_space_point))
-      continue;
-
-    found_layer = current_layer;
-    break;
-  }
-
-  // This can potentially return NULL, which means the screen_space_point did
-  // not successfully hit test any layers, not even the root layer.
-  return found_layer;
-}
-
-LayerImpl* LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-    const gfx::PointF& screen_space_point,
-    const LayerImplList& render_surface_layer_list) {
-  typedef LayerIterator<LayerImpl> LayerIteratorType;
-  LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list);
-  for (LayerIteratorType it =
-           LayerIteratorType::Begin(&render_surface_layer_list);
-       it != end;
-       ++it) {
-    // We don't want to consider render_surfaces for hit testing.
-    if (!it.represents_itself())
-      continue;
-
-    LayerImpl* current_layer = (*it);
-    if (!PointHitsLayer(current_layer, screen_space_point))
-      continue;
-
-    if (LayerTreeHostCommon::LayerHasTouchEventHandlersAt(screen_space_point,
-                                                          current_layer))
-      return current_layer;
-
-    // Note that we could stop searching if we hit a layer we know to be
-    // opaque to hit-testing, but knowing that reliably is tricky (eg. due to
-    // CSS pointer-events: none).  Also blink has an optimization for the
-    // common case of an entire document having handlers where it doesn't
-    // report any rects for child layers (since it knows they can't exceed
-    // the document bounds).
-  }
-  return NULL;
-}
-
-bool LayerTreeHostCommon::LayerHasTouchEventHandlersAt(
-    const gfx::PointF& screen_space_point,
-    LayerImpl* layer_impl) {
-  if (layer_impl->touch_event_handler_region().IsEmpty())
-    return false;
-
-  if (!PointHitsRegion(screen_space_point,
-                       layer_impl->screen_space_transform(),
-                       layer_impl->touch_event_handler_region(),
-                       layer_impl->contents_scale_x(),
-                       layer_impl->contents_scale_y()))
-    return false;
-
-  // At this point, we think the point does hit the touch event handler region
-  // on the layer, but we need to walk up the parents to ensure that the layer
-  // was not clipped in such a way that the hit point actually should not hit
-  // the layer.
-  if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer_impl))
-    return false;
-
-  return true;
-}
 }  // namespace cc
diff --git a/cc/trees/layer_tree_host_common.h b/cc/trees/layer_tree_host_common.h
index 5090c69..0e13947 100644
--- a/cc/trees/layer_tree_host_common.h
+++ b/cc/trees/layer_tree_host_common.h
@@ -99,24 +99,6 @@ class CC_EXPORT LayerTreeHostCommon {
       CalcDrawPropsImplInputsForTesting;
   static void CalculateDrawProperties(CalcDrawPropsImplInputs* inputs);
 
-  // Performs hit testing for a given render_surface_layer_list.
-  static LayerImpl* FindFirstScrollingLayerThatIsHitByPoint(
-      const gfx::PointF& screen_space_point,
-      const LayerImplList& render_surface_layer_list);
-
-  // Performs hit testing for a given render_surface_layer_list.
-  static LayerImpl* FindLayerThatIsHitByPoint(
-      const gfx::PointF& screen_space_point,
-      const LayerImplList& render_surface_layer_list);
-
-  static LayerImpl* FindLayerThatIsHitByPointInTouchHandlerRegion(
-      const gfx::PointF& screen_space_point,
-      const LayerImplList& render_surface_layer_list);
-
-  static bool LayerHasTouchEventHandlersAt(
-      const gfx::PointF& screen_space_point,
-      LayerImpl* layer_impl);
-
   template <typename LayerType>
   static bool RenderSurfaceContributesToTarget(LayerType*,
                                                int target_surface_layer_id);
diff --git a/cc/trees/layer_tree_host_common_unittest.cc b/cc/trees/layer_tree_host_common_unittest.cc
index 48a665d..43d94da 100644
--- a/cc/trees/layer_tree_host_common_unittest.cc
+++ b/cc/trees/layer_tree_host_common_unittest.cc
@@ -11,7 +11,6 @@
 #include "cc/base/math_util.h"
 #include "cc/layers/content_layer.h"
 #include "cc/layers/content_layer_client.h"
-#include "cc/layers/heads_up_display_layer_impl.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_client.h"
 #include "cc/layers/layer_impl.h"
@@ -25,183 +24,18 @@
 #include "cc/test/fake_layer_tree_host.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "cc/test/geometry_test_utils.h"
+#include "cc/test/layer_tree_host_common_test.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "cc/trees/proxy.h"
 #include "cc/trees/single_thread_proxy.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/quad_f.h"
-#include "ui/gfx/size_conversions.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 namespace {
 
-class LayerTreeHostCommonTestBase {
- protected:
-  LayerTreeHostCommonTestBase() : render_surface_layer_list_count_(0) {}
-
-  template <typename LayerType>
-  void SetLayerPropertiesForTestingInternal(
-      LayerType* layer,
-      const gfx::Transform& transform,
-      const gfx::PointF& anchor,
-      const gfx::PointF& position,
-      const gfx::Size& bounds,
-      bool flatten_transform,
-      bool is_3d_sorted) {
-    layer->SetTransform(transform);
-    layer->SetAnchorPoint(anchor);
-    layer->SetPosition(position);
-    layer->SetBounds(bounds);
-    layer->SetShouldFlattenTransform(flatten_transform);
-    layer->SetIs3dSorted(is_3d_sorted);
-  }
-
-  void SetLayerPropertiesForTesting(Layer* layer,
-                                    const gfx::Transform& transform,
-                                    const gfx::PointF& anchor,
-                                    const gfx::PointF& position,
-                                    const gfx::Size& bounds,
-                                    bool flatten_transform,
-                                    bool is_3d_sorted) {
-    SetLayerPropertiesForTestingInternal<Layer>(layer,
-                                                transform,
-                                                anchor,
-                                                position,
-                                                bounds,
-                                                flatten_transform,
-                                                is_3d_sorted);
-  }
-
-  void SetLayerPropertiesForTesting(LayerImpl* layer,
-                                    const gfx::Transform& transform,
-                                    const gfx::PointF& anchor,
-                                    const gfx::PointF& position,
-                                    const gfx::Size& bounds,
-                                    bool flatten_transform,
-                                    bool is_3d_sorted) {
-    SetLayerPropertiesForTestingInternal<LayerImpl>(layer,
-                                                    transform,
-                                                    anchor,
-                                                    position,
-                                                    bounds,
-                                                    flatten_transform,
-                                                    is_3d_sorted);
-    layer->SetContentBounds(bounds);
-  }
-
-  void ExecuteCalculateDrawProperties(Layer* root_layer,
-                                      float device_scale_factor,
-                                      float page_scale_factor,
-                                      Layer* page_scale_application_layer,
-                                      bool can_use_lcd_text) {
-    EXPECT_TRUE(page_scale_application_layer || (page_scale_factor == 1.f));
-    gfx::Transform identity_matrix;
-    gfx::Size device_viewport_size =
-        gfx::Size(root_layer->bounds().width() * device_scale_factor,
-                  root_layer->bounds().height() * device_scale_factor);
-
-    render_surface_layer_list_.reset(new RenderSurfaceLayerList);
-
-    // We are probably not testing what is intended if the root_layer bounds are
-    // empty.
-    DCHECK(!root_layer->bounds().IsEmpty());
-    LayerTreeHostCommon::CalcDrawPropsMainInputsForTesting inputs(
-        root_layer, device_viewport_size, render_surface_layer_list_.get());
-    inputs.device_scale_factor = device_scale_factor;
-    inputs.page_scale_factor = page_scale_factor;
-    inputs.page_scale_application_layer = page_scale_application_layer;
-    inputs.can_use_lcd_text = can_use_lcd_text;
-    inputs.can_adjust_raster_scales = true;
-    LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-  }
-
-  void ExecuteCalculateDrawProperties(LayerImpl* root_layer,
-                                      float device_scale_factor,
-                                      float page_scale_factor,
-                                      LayerImpl* page_scale_application_layer,
-                                      bool can_use_lcd_text) {
-    gfx::Transform identity_matrix;
-    gfx::Size device_viewport_size =
-        gfx::Size(root_layer->bounds().width() * device_scale_factor,
-                  root_layer->bounds().height() * device_scale_factor);
-
-    render_surface_layer_list_impl_.reset(new LayerImplList);
-
-    // We are probably not testing what is intended if the root_layer bounds are
-    // empty.
-    DCHECK(!root_layer->bounds().IsEmpty());
-    LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-        root_layer,
-        device_viewport_size,
-        render_surface_layer_list_impl_.get());
-    inputs.device_scale_factor = device_scale_factor;
-    inputs.page_scale_factor = page_scale_factor;
-    inputs.page_scale_application_layer = page_scale_application_layer;
-    inputs.can_use_lcd_text = can_use_lcd_text;
-    inputs.can_adjust_raster_scales = true;
-
-    ++render_surface_layer_list_count_;
-    inputs.current_render_surface_layer_list_id =
-        render_surface_layer_list_count_;
-
-    LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-  }
-
-  template <class LayerType>
-  void ExecuteCalculateDrawProperties(LayerType* root_layer) {
-    LayerType* page_scale_application_layer = NULL;
-    ExecuteCalculateDrawProperties(
-        root_layer, 1.f, 1.f, page_scale_application_layer, false);
-  }
-
-  template <class LayerType>
-  void ExecuteCalculateDrawProperties(LayerType* root_layer,
-                                      float device_scale_factor) {
-    LayerType* page_scale_application_layer = NULL;
-    ExecuteCalculateDrawProperties(root_layer,
-                                   device_scale_factor,
-                                   1.f,
-                                   page_scale_application_layer,
-                                   false);
-  }
-
-  template <class LayerType>
-  void ExecuteCalculateDrawProperties(LayerType* root_layer,
-                                      float device_scale_factor,
-                                      float page_scale_factor,
-                                      LayerType* page_scale_application_layer) {
-    ExecuteCalculateDrawProperties(root_layer,
-                                   device_scale_factor,
-                                   page_scale_factor,
-                                   page_scale_application_layer,
-                                   false);
-  }
-
-  RenderSurfaceLayerList* render_surface_layer_list() const {
-    return render_surface_layer_list_.get();
-  }
-
-  LayerImplList* render_surface_layer_list_impl() const {
-    return render_surface_layer_list_impl_.get();
-  }
-
-  int render_surface_layer_list_count() const {
-    return render_surface_layer_list_count_;
-  }
-
- private:
-  scoped_ptr<RenderSurfaceLayerList> render_surface_layer_list_;
-  scoped_ptr<LayerImplList> render_surface_layer_list_impl_;
-
-  int render_surface_layer_list_count_;
-};
-
-class LayerTreeHostCommonTest : public LayerTreeHostCommonTestBase,
-                                public testing::Test {
-};
-
 class LayerWithForcedDrawsContent : public Layer {
  public:
   LayerWithForcedDrawsContent() : Layer(), last_device_scale_factor_(0.f) {}
@@ -4161,1986 +3995,6 @@ TEST_F(LayerTreeHostCommonTest,
                 ->render_surface()->layer_list().at(1)->id());
 }
 
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForEmptyLayerList) {
-  // Hit testing on an empty render_surface_layer_list should return a null
-  // pointer.
-  LayerImplList render_surface_layer_list;
-
-  gfx::Point test_point(0, 0);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(10, 20);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForSingleLayer) {
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root =
-      LayerImpl::Create(host_impl.active_tree(), 12345);
-
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-  gfx::PointF position;
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               position,
-                               bounds,
-                               true,
-                               false);
-  root->SetDrawsContent(true);
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-
-  // Hit testing for a point outside the layer should return a null pointer.
-  gfx::Point test_point(101, 101);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(-1, -1);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit testing for a point inside should return the root layer.
-  test_point = gfx::Point(1, 1);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-
-  test_point = gfx::Point(99, 99);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForSingleLayerAndHud) {
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root =
-      LayerImpl::Create(host_impl.active_tree(), 12345);
-  scoped_ptr<HeadsUpDisplayLayerImpl> hud =
-      HeadsUpDisplayLayerImpl::Create(host_impl.active_tree(), 11111);
-
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-  gfx::PointF position;
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               position,
-                               bounds,
-                               true,
-                               false);
-  root->SetDrawsContent(true);
-
-  // Create hud and add it as a child of root.
-  gfx::Size hud_bounds(200, 200);
-  SetLayerPropertiesForTesting(hud.get(),
-                               identity_matrix,
-                               anchor,
-                               position,
-                               hud_bounds,
-                               true,
-                               false);
-  hud->SetDrawsContent(true);
-
-  host_impl.active_tree()->set_hud_layer(hud.get());
-  root->AddChild(hud.PassAs<LayerImpl>());
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), hud_bounds, &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(2u, root->render_surface()->layer_list().size());
-
-  // Hit testing for a point inside HUD, but outside root should return null
-  gfx::Point test_point(101, 101);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(-1, -1);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit testing for a point inside should return the root layer, never the HUD
-  // layer.
-  test_point = gfx::Point(1, 1);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-
-  test_point = gfx::Point(99, 99);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForUninvertibleTransform) {
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root =
-      LayerImpl::Create(host_impl.active_tree(), 12345);
-
-  gfx::Transform uninvertible_transform;
-  uninvertible_transform.matrix().set(0, 0, 0.0);
-  uninvertible_transform.matrix().set(1, 1, 0.0);
-  uninvertible_transform.matrix().set(2, 2, 0.0);
-  uninvertible_transform.matrix().set(3, 3, 0.0);
-  ASSERT_FALSE(uninvertible_transform.IsInvertible());
-
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-  gfx::PointF position;
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(root.get(),
-                               uninvertible_transform,
-                               anchor,
-                               position,
-                               bounds,
-                               true,
-                               false);
-  root->SetDrawsContent(true);
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-  ASSERT_FALSE(root->screen_space_transform().IsInvertible());
-
-  // Hit testing any point should not hit the layer. If the invertible matrix is
-  // accidentally ignored and treated like an identity, then the hit testing
-  // will incorrectly hit the layer when it shouldn't.
-  gfx::Point test_point(1, 1);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(10, 10);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(10, 30);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(50, 50);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(67, 48);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(99, 99);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(-1, -1);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForSinglePositionedLayer) {
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root =
-      LayerImpl::Create(host_impl.active_tree(), 12345);
-
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-  // this layer is positioned, and hit testing should correctly know where the
-  // layer is located.
-  gfx::PointF position(50.f, 50.f);
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               position,
-                               bounds,
-                               true,
-                               false);
-  root->SetDrawsContent(true);
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-
-  // Hit testing for a point outside the layer should return a null pointer.
-  gfx::Point test_point(49, 49);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Even though the layer exists at (101, 101), it should not be visible there
-  // since the root render surface would clamp it.
-  test_point = gfx::Point(101, 101);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit testing for a point inside should return the root layer.
-  test_point = gfx::Point(51, 51);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-
-  test_point = gfx::Point(99, 99);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForSingleRotatedLayer) {
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root =
-      LayerImpl::Create(host_impl.active_tree(), 12345);
-
-  gfx::Transform identity_matrix;
-  gfx::Transform rotation45_degrees_about_center;
-  rotation45_degrees_about_center.Translate(50.0, 50.0);
-  rotation45_degrees_about_center.RotateAboutZAxis(45.0);
-  rotation45_degrees_about_center.Translate(-50.0, -50.0);
-  gfx::PointF anchor;
-  gfx::PointF position;
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(root.get(),
-                               rotation45_degrees_about_center,
-                               anchor,
-                               position,
-                               bounds,
-                               true,
-                               false);
-  root->SetDrawsContent(true);
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-
-  // Hit testing for points outside the layer.
-  // These corners would have been inside the un-transformed layer, but they
-  // should not hit the correctly transformed layer.
-  gfx::Point test_point(99, 99);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(1, 1);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit testing for a point inside should return the root layer.
-  test_point = gfx::Point(1, 50);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-
-  // Hit testing the corners that would overlap the unclipped layer, but are
-  // outside the clipped region.
-  test_point = gfx::Point(50, -1);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_FALSE(result_layer);
-
-  test_point = gfx::Point(-1, 50);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_FALSE(result_layer);
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForSinglePerspectiveLayer) {
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root =
-      LayerImpl::Create(host_impl.active_tree(), 12345);
-
-  gfx::Transform identity_matrix;
-
-  // perspective_projection_about_center * translation_by_z is designed so that
-  // the 100 x 100 layer becomes 50 x 50, and remains centered at (50, 50).
-  gfx::Transform perspective_projection_about_center;
-  perspective_projection_about_center.Translate(50.0, 50.0);
-  perspective_projection_about_center.ApplyPerspectiveDepth(1.0);
-  perspective_projection_about_center.Translate(-50.0, -50.0);
-  gfx::Transform translation_by_z;
-  translation_by_z.Translate3d(0.0, 0.0, -1.0);
-
-  gfx::PointF anchor;
-  gfx::PointF position;
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(
-      root.get(),
-      perspective_projection_about_center * translation_by_z,
-      anchor,
-      position,
-      bounds,
-      true,
-      false);
-  root->SetDrawsContent(true);
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-
-  // Hit testing for points outside the layer.
-  // These corners would have been inside the un-transformed layer, but they
-  // should not hit the correctly transformed layer.
-  gfx::Point test_point(24, 24);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(76, 76);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit testing for a point inside should return the root layer.
-  test_point = gfx::Point(26, 26);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-
-  test_point = gfx::Point(74, 74);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForSingleLayerWithScaledContents) {
-  // A layer's visible content rect is actually in the layer's content space.
-  // The screen space transform converts from the layer's origin space to screen
-  // space. This test makes sure that hit testing works correctly accounts for
-  // the contents scale.  A contents scale that is not 1 effectively forces a
-  // non-identity transform between layer's content space and layer's origin
-  // space. The hit testing code must take this into account.
-  //
-  // To test this, the layer is positioned at (25, 25), and is size (50, 50). If
-  // contents scale is ignored, then hit testing will mis-interpret the visible
-  // content rect as being larger than the actual bounds of the layer.
-  //
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
-
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               gfx::PointF(),
-                               gfx::Size(100, 100),
-                               true,
-                               false);
-  {
-    gfx::PointF position(25.f, 25.f);
-    gfx::Size bounds(50, 50);
-    scoped_ptr<LayerImpl> test_layer =
-        LayerImpl::Create(host_impl.active_tree(), 12345);
-    SetLayerPropertiesForTesting(test_layer.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-
-    // override content bounds and contents scale
-    test_layer->SetContentBounds(gfx::Size(100, 100));
-    test_layer->SetContentsScale(2, 2);
-
-    test_layer->SetDrawsContent(true);
-    root->AddChild(test_layer.Pass());
-  }
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  // The visible content rect for test_layer is actually 100x100, even though
-  // its layout size is 50x50, positioned at 25x25.
-  LayerImpl* test_layer = root->children()[0];
-  EXPECT_RECT_EQ(gfx::Rect(0, 0, 100, 100),
-                 test_layer->visible_content_rect());
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-
-  // Hit testing for a point outside the layer should return a null pointer (the
-  // root layer does not draw content, so it will not be hit tested either).
-  gfx::Point test_point(101, 101);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(24, 24);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(76, 76);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit testing for a point inside should return the test layer.
-  test_point = gfx::Point(26, 26);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-
-  test_point = gfx::Point(74, 74);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForSimpleClippedLayer) {
-  // Test that hit-testing will only work for the visible portion of a layer,
-  // and not the entire layer bounds. Here we just test the simple axis-aligned
-  // case.
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               gfx::PointF(),
-                               gfx::Size(100, 100),
-                               true,
-                               false);
-  {
-    scoped_ptr<LayerImpl> clipping_layer =
-        LayerImpl::Create(host_impl.active_tree(), 123);
-    // this layer is positioned, and hit testing should correctly know where the
-    // layer is located.
-    gfx::PointF position(25.f, 25.f);
-    gfx::Size bounds(50, 50);
-    SetLayerPropertiesForTesting(clipping_layer.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    clipping_layer->SetMasksToBounds(true);
-
-    scoped_ptr<LayerImpl> child =
-        LayerImpl::Create(host_impl.active_tree(), 456);
-    position = gfx::PointF(-50.f, -50.f);
-    bounds = gfx::Size(300, 300);
-    SetLayerPropertiesForTesting(child.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    child->SetDrawsContent(true);
-    clipping_layer->AddChild(child.Pass());
-    root->AddChild(clipping_layer.Pass());
-  }
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-  ASSERT_EQ(456, root->render_surface()->layer_list().at(0)->id());
-
-  // Hit testing for a point outside the layer should return a null pointer.
-  // Despite the child layer being very large, it should be clipped to the root
-  // layer's bounds.
-  gfx::Point test_point(24, 24);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Even though the layer exists at (101, 101), it should not be visible there
-  // since the clipping_layer would clamp it.
-  test_point = gfx::Point(76, 76);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit testing for a point inside should return the child layer.
-  test_point = gfx::Point(26, 26);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(456, result_layer->id());
-
-  test_point = gfx::Point(74, 74);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(456, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForMultiClippedRotatedLayer) {
-  // This test checks whether hit testing correctly avoids hit testing with
-  // multiple ancestors that clip in non axis-aligned ways. To pass this test,
-  // the hit testing algorithm needs to recognize that multiple parent layers
-  // may clip the layer, and should not actually hit those clipped areas.
-  //
-  // The child and grand_child layers are both initialized to clip the
-  // rotated_leaf. The child layer is rotated about the top-left corner, so that
-  // the root + child clips combined create a triangle. The rotated_leaf will
-  // only be visible where it overlaps this triangle.
-  //
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 123);
-
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-  gfx::PointF position;
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               position,
-                               bounds,
-                               true,
-                               false);
-  root->SetMasksToBounds(true);
-  {
-    scoped_ptr<LayerImpl> child =
-        LayerImpl::Create(host_impl.active_tree(), 456);
-    scoped_ptr<LayerImpl> grand_child =
-        LayerImpl::Create(host_impl.active_tree(), 789);
-    scoped_ptr<LayerImpl> rotated_leaf =
-        LayerImpl::Create(host_impl.active_tree(), 2468);
-
-    position = gfx::PointF(10.f, 10.f);
-    bounds = gfx::Size(80, 80);
-    SetLayerPropertiesForTesting(child.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    child->SetMasksToBounds(true);
-
-    gfx::Transform rotation45_degrees_about_corner;
-    rotation45_degrees_about_corner.RotateAboutZAxis(45.0);
-
-    // remember, positioned with respect to its parent which is already at 10,
-    // 10
-    position = gfx::PointF();
-    bounds =
-        gfx::Size(200, 200);  // to ensure it covers at least sqrt(2) * 100.
-    SetLayerPropertiesForTesting(grand_child.get(),
-                                 rotation45_degrees_about_corner,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    grand_child->SetMasksToBounds(true);
-
-    // Rotates about the center of the layer
-    gfx::Transform rotated_leaf_transform;
-    rotated_leaf_transform.Translate(
-        -10.0, -10.0);  // cancel out the grand_parent's position
-    rotated_leaf_transform.RotateAboutZAxis(
-        -45.0);  // cancel out the corner 45-degree rotation of the parent.
-    rotated_leaf_transform.Translate(50.0, 50.0);
-    rotated_leaf_transform.RotateAboutZAxis(45.0);
-    rotated_leaf_transform.Translate(-50.0, -50.0);
-    position = gfx::PointF();
-    bounds = gfx::Size(100, 100);
-    SetLayerPropertiesForTesting(rotated_leaf.get(),
-                                 rotated_leaf_transform,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    rotated_leaf->SetDrawsContent(true);
-
-    grand_child->AddChild(rotated_leaf.Pass());
-    child->AddChild(grand_child.Pass());
-    root->AddChild(child.Pass());
-  }
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  // The grand_child is expected to create a render surface because it
-  // MasksToBounds and is not axis aligned.
-  ASSERT_EQ(2u, render_surface_layer_list.size());
-  ASSERT_EQ(
-      1u,
-      render_surface_layer_list.at(0)->render_surface()->layer_list().size());
-  ASSERT_EQ(789,
-            render_surface_layer_list.at(0)->render_surface()->layer_list().at(
-                0)->id());  // grand_child's surface.
-  ASSERT_EQ(
-      1u,
-      render_surface_layer_list.at(1)->render_surface()->layer_list().size());
-  ASSERT_EQ(
-      2468,
-      render_surface_layer_list[1]->render_surface()->layer_list().at(0)->id());
-
-  // (11, 89) is close to the the bottom left corner within the clip, but it is
-  // not inside the layer.
-  gfx::Point test_point(11, 89);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Closer inwards from the bottom left will overlap the layer.
-  test_point = gfx::Point(25, 75);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(2468, result_layer->id());
-
-  // (4, 50) is inside the unclipped layer, but that corner of the layer should
-  // be clipped away by the grandparent and should not get hit. If hit testing
-  // blindly uses visible content rect without considering how parent may clip
-  // the layer, then hit testing would accidentally think that the point
-  // successfully hits the layer.
-  test_point = gfx::Point(4, 50);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // (11, 50) is inside the layer and within the clipped area.
-  test_point = gfx::Point(11, 50);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(2468, result_layer->id());
-
-  // Around the middle, just to the right and up, would have hit the layer
-  // except that that area should be clipped away by the parent.
-  test_point = gfx::Point(51, 49);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Around the middle, just to the left and down, should successfully hit the
-  // layer.
-  test_point = gfx::Point(49, 51);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(2468, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForNonClippingIntermediateLayer) {
-  // This test checks that hit testing code does not accidentally clip to layer
-  // bounds for a layer that actually does not clip.
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               gfx::PointF(),
-                               gfx::Size(100, 100),
-                               true,
-                               false);
-  {
-    scoped_ptr<LayerImpl> intermediate_layer =
-        LayerImpl::Create(host_impl.active_tree(), 123);
-    // this layer is positioned, and hit testing should correctly know where the
-    // layer is located.
-    gfx::PointF position(10.f, 10.f);
-    gfx::Size bounds(50, 50);
-    SetLayerPropertiesForTesting(intermediate_layer.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    // Sanity check the intermediate layer should not clip.
-    ASSERT_FALSE(intermediate_layer->masks_to_bounds());
-    ASSERT_FALSE(intermediate_layer->mask_layer());
-
-    // The child of the intermediate_layer is translated so that it does not
-    // overlap intermediate_layer at all.  If child is incorrectly clipped, we
-    // would not be able to hit it successfully.
-    scoped_ptr<LayerImpl> child =
-        LayerImpl::Create(host_impl.active_tree(), 456);
-    position = gfx::PointF(60.f, 60.f);  // 70, 70 in screen space
-    bounds = gfx::Size(20, 20);
-    SetLayerPropertiesForTesting(child.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    child->SetDrawsContent(true);
-    intermediate_layer->AddChild(child.Pass());
-    root->AddChild(intermediate_layer.Pass());
-  }
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-  ASSERT_EQ(456, root->render_surface()->layer_list().at(0)->id());
-
-  // Hit testing for a point outside the layer should return a null pointer.
-  gfx::Point test_point(69, 69);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(91, 91);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit testing for a point inside should return the child layer.
-  test_point = gfx::Point(71, 71);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(456, result_layer->id());
-
-  test_point = gfx::Point(89, 89);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(456, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForMultipleLayers) {
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
-
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-  gfx::PointF position;
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               position,
-                               bounds,
-                               true,
-                               false);
-  root->SetDrawsContent(true);
-  {
-    // child 1 and child2 are initialized to overlap between x=50 and x=60.
-    // grand_child is set to overlap both child1 and child2 between y=50 and
-    // y=60.  The expected stacking order is: (front) child2, (second)
-    // grand_child, (third) child1, and (back) the root layer behind all other
-    // layers.
-
-    scoped_ptr<LayerImpl> child1 =
-        LayerImpl::Create(host_impl.active_tree(), 2);
-    scoped_ptr<LayerImpl> child2 =
-        LayerImpl::Create(host_impl.active_tree(), 3);
-    scoped_ptr<LayerImpl> grand_child1 =
-        LayerImpl::Create(host_impl.active_tree(), 4);
-
-    position = gfx::PointF(10.f, 10.f);
-    bounds = gfx::Size(50, 50);
-    SetLayerPropertiesForTesting(child1.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    child1->SetDrawsContent(true);
-
-    position = gfx::PointF(50.f, 10.f);
-    bounds = gfx::Size(50, 50);
-    SetLayerPropertiesForTesting(child2.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    child2->SetDrawsContent(true);
-
-    // Remember that grand_child is positioned with respect to its parent (i.e.
-    // child1).  In screen space, the intended position is (10, 50), with size
-    // 100 x 50.
-    position = gfx::PointF(0.f, 40.f);
-    bounds = gfx::Size(100, 50);
-    SetLayerPropertiesForTesting(grand_child1.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    grand_child1->SetDrawsContent(true);
-
-    child1->AddChild(grand_child1.Pass());
-    root->AddChild(child1.Pass());
-    root->AddChild(child2.Pass());
-  }
-
-  LayerImpl* child1 = root->children()[0];
-  LayerImpl* child2 = root->children()[1];
-  LayerImpl* grand_child1 = child1->children()[0];
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_TRUE(child1);
-  ASSERT_TRUE(child2);
-  ASSERT_TRUE(grand_child1);
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-
-  RenderSurfaceImpl* root_render_surface = root->render_surface();
-  ASSERT_EQ(4u, root_render_surface->layer_list().size());
-  ASSERT_EQ(1, root_render_surface->layer_list().at(0)->id());  // root layer
-  ASSERT_EQ(2, root_render_surface->layer_list().at(1)->id());  // child1
-  ASSERT_EQ(4, root_render_surface->layer_list().at(2)->id());  // grand_child1
-  ASSERT_EQ(3, root_render_surface->layer_list().at(3)->id());  // child2
-
-  // Nothing overlaps the root_layer at (1, 1), so hit testing there should find
-  // the root layer.
-  gfx::Point test_point = gfx::Point(1, 1);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(1, result_layer->id());
-
-  // At (15, 15), child1 and root are the only layers. child1 is expected to be
-  // on top.
-  test_point = gfx::Point(15, 15);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(2, result_layer->id());
-
-  // At (51, 20), child1 and child2 overlap. child2 is expected to be on top.
-  test_point = gfx::Point(51, 20);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(3, result_layer->id());
-
-  // At (80, 51), child2 and grand_child1 overlap. child2 is expected to be on
-  // top.
-  test_point = gfx::Point(80, 51);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(3, result_layer->id());
-
-  // At (51, 51), all layers overlap each other. child2 is expected to be on top
-  // of all other layers.
-  test_point = gfx::Point(51, 51);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(3, result_layer->id());
-
-  // At (20, 51), child1 and grand_child1 overlap. grand_child1 is expected to
-  // be on top.
-  test_point = gfx::Point(20, 51);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(4, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForMultipleLayerLists) {
-  //
-  // The geometry is set up similarly to the previous case, but
-  // all layers are forced to be render surfaces now.
-  //
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
-
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-  gfx::PointF position;
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               position,
-                               bounds,
-                               true,
-                               false);
-  root->SetDrawsContent(true);
-  {
-    // child 1 and child2 are initialized to overlap between x=50 and x=60.
-    // grand_child is set to overlap both child1 and child2 between y=50 and
-    // y=60.  The expected stacking order is: (front) child2, (second)
-    // grand_child, (third) child1, and (back) the root layer behind all other
-    // layers.
-
-    scoped_ptr<LayerImpl> child1 =
-        LayerImpl::Create(host_impl.active_tree(), 2);
-    scoped_ptr<LayerImpl> child2 =
-        LayerImpl::Create(host_impl.active_tree(), 3);
-    scoped_ptr<LayerImpl> grand_child1 =
-        LayerImpl::Create(host_impl.active_tree(), 4);
-
-    position = gfx::PointF(10.f, 10.f);
-    bounds = gfx::Size(50, 50);
-    SetLayerPropertiesForTesting(child1.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    child1->SetDrawsContent(true);
-    child1->SetForceRenderSurface(true);
-
-    position = gfx::PointF(50.f, 10.f);
-    bounds = gfx::Size(50, 50);
-    SetLayerPropertiesForTesting(child2.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    child2->SetDrawsContent(true);
-    child2->SetForceRenderSurface(true);
-
-    // Remember that grand_child is positioned with respect to its parent (i.e.
-    // child1).  In screen space, the intended position is (10, 50), with size
-    // 100 x 50.
-    position = gfx::PointF(0.f, 40.f);
-    bounds = gfx::Size(100, 50);
-    SetLayerPropertiesForTesting(grand_child1.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    grand_child1->SetDrawsContent(true);
-    grand_child1->SetForceRenderSurface(true);
-
-    child1->AddChild(grand_child1.Pass());
-    root->AddChild(child1.Pass());
-    root->AddChild(child2.Pass());
-  }
-
-  LayerImpl* child1 = root->children()[0];
-  LayerImpl* child2 = root->children()[1];
-  LayerImpl* grand_child1 = child1->children()[0];
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_TRUE(child1);
-  ASSERT_TRUE(child2);
-  ASSERT_TRUE(grand_child1);
-  ASSERT_TRUE(child1->render_surface());
-  ASSERT_TRUE(child2->render_surface());
-  ASSERT_TRUE(grand_child1->render_surface());
-  ASSERT_EQ(4u, render_surface_layer_list.size());
-  // The root surface has the root layer, and child1's and child2's render
-  // surfaces.
-  ASSERT_EQ(3u, root->render_surface()->layer_list().size());
-  // The child1 surface has the child1 layer and grand_child1's render surface.
-  ASSERT_EQ(2u, child1->render_surface()->layer_list().size());
-  ASSERT_EQ(1u, child2->render_surface()->layer_list().size());
-  ASSERT_EQ(1u, grand_child1->render_surface()->layer_list().size());
-  ASSERT_EQ(1, render_surface_layer_list.at(0)->id());  // root layer
-  ASSERT_EQ(2, render_surface_layer_list[1]->id());  // child1
-  ASSERT_EQ(4, render_surface_layer_list.at(2)->id());  // grand_child1
-  ASSERT_EQ(3, render_surface_layer_list[3]->id());  // child2
-
-  // Nothing overlaps the root_layer at (1, 1), so hit testing there should find
-  // the root layer.
-  gfx::Point test_point = gfx::Point(1, 1);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(1, result_layer->id());
-
-  // At (15, 15), child1 and root are the only layers. child1 is expected to be
-  // on top.
-  test_point = gfx::Point(15, 15);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(2, result_layer->id());
-
-  // At (51, 20), child1 and child2 overlap. child2 is expected to be on top.
-  test_point = gfx::Point(51, 20);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(3, result_layer->id());
-
-  // At (80, 51), child2 and grand_child1 overlap. child2 is expected to be on
-  // top.
-  test_point = gfx::Point(80, 51);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(3, result_layer->id());
-
-  // At (51, 51), all layers overlap each other. child2 is expected to be on top
-  // of all other layers.
-  test_point = gfx::Point(51, 51);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(3, result_layer->id());
-
-  // At (20, 51), child1 and grand_child1 overlap. grand_child1 is expected to
-  // be on top.
-  test_point = gfx::Point(20, 51);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(4, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest, HitTestingForEmptyLayers) {
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-
-  // Layer 1 - root
-  scoped_ptr<LayerImpl> root =
-      LayerImpl::Create(host_impl.active_tree(), 1);
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-  gfx::PointF position;
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               position,
-                               bounds,
-                               true,
-                               false);
-  root->SetDrawsContent(true);
-
-  {
-    // Layer 2 - empty: drawsContent=false
-    gfx::PointF position(10.f, 10.f);
-    gfx::Size bounds(30, 30);
-    scoped_ptr<LayerImpl> empty_layer =
-        LayerImpl::Create(host_impl.active_tree(), 2);
-    SetLayerPropertiesForTesting(empty_layer.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-
-    empty_layer->SetDrawsContent(false);
-    root->AddChild(empty_layer.Pass());
-  }
-
-  {
-    // Layer 3 - empty, but has touch handler
-    gfx::PointF position(10.f, 60.f);
-    gfx::Size bounds(30, 30);
-    scoped_ptr<LayerImpl> test_layer =
-        LayerImpl::Create(host_impl.active_tree(), 3);
-    SetLayerPropertiesForTesting(test_layer.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-
-    test_layer->SetDrawsContent(false);
-    Region touch_handler_region(gfx::Rect(10, 10, 10, 10));
-    test_layer->SetTouchEventHandlerRegion(touch_handler_region);
-    root->AddChild(test_layer.Pass());
-  }
-
-  {
-    // Layer 4 - empty, but has mousewheel handler
-    gfx::PointF position(60.f, 60.f);
-    gfx::Size bounds(30, 30);
-    scoped_ptr<LayerImpl> test_layer =
-        LayerImpl::Create(host_impl.active_tree(), 4);
-    SetLayerPropertiesForTesting(test_layer.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-
-    test_layer->SetDrawsContent(false);
-    test_layer->SetHaveWheelEventHandlers(true);
-    root->AddChild(test_layer.Pass());
-  }
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Verify that the root layer and empty layers with touch/wheel handlers
-  // (but not the empty layer without a touch handler) are in the RSSL.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  EXPECT_EQ(1, render_surface_layer_list[0]->id());
-  ASSERT_EQ(3u, root->render_surface()->layer_list().size());
-  EXPECT_EQ(1, root->render_surface()->layer_list().at(0)->id());
-  EXPECT_EQ(3, root->render_surface()->layer_list().at(1)->id());
-  EXPECT_EQ(4, root->render_surface()->layer_list().at(2)->id());
-
-  // Hit testing for a point inside the empty no-handlers layer should return
-  // the root layer.
-  gfx::Point test_point = gfx::Point(15, 15);
-  LayerImpl* result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(1, result_layer->id());
-
-  // Hit testing for a point inside the touch handler layer should return it.
-  test_point = gfx::Point(15, 75);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(3, result_layer->id());
-
-  // Hit testing for a point inside the mousewheel layer should return it.
-  test_point = gfx::Point(75, 75);
-  result_layer = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(4, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest,
-       HitCheckingTouchHandlerRegionsForEmptyLayerList) {
-  // Hit checking on an empty render_surface_layer_list should return a null
-  // pointer.
-  LayerImplList render_surface_layer_list;
-
-  gfx::Point test_point(0, 0);
-  LayerImpl* result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(10, 20);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-}
-
-TEST_F(LayerTreeHostCommonTest, HitCheckingTouchHandlerRegionsForSingleLayer) {
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root =
-      LayerImpl::Create(host_impl.active_tree(), 12345);
-
-  gfx::Transform identity_matrix;
-  Region touch_handler_region(gfx::Rect(10, 10, 50, 50));
-  gfx::PointF anchor;
-  gfx::PointF position;
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               position,
-                               bounds,
-                               true,
-                               false);
-  root->SetDrawsContent(true);
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-
-  // Hit checking for any point should return a null pointer for a layer without
-  // any touch event handler regions.
-  gfx::Point test_point(11, 11);
-  LayerImpl* result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  root->SetTouchEventHandlerRegion(touch_handler_region);
-  // Hit checking for a point outside the layer should return a null pointer.
-  test_point = gfx::Point(101, 101);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(-1, -1);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit checking for a point inside the layer, but outside the touch handler
-  // region should return a null pointer.
-  test_point = gfx::Point(1, 1);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(99, 99);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit checking for a point inside the touch event handler region should
-  // return the root layer.
-  test_point = gfx::Point(11, 11);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-
-  test_point = gfx::Point(59, 59);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest,
-     HitCheckingTouchHandlerRegionsForUninvertibleTransform) {
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root =
-      LayerImpl::Create(host_impl.active_tree(), 12345);
-
-  gfx::Transform uninvertible_transform;
-  uninvertible_transform.matrix().set(0, 0, 0.0);
-  uninvertible_transform.matrix().set(1, 1, 0.0);
-  uninvertible_transform.matrix().set(2, 2, 0.0);
-  uninvertible_transform.matrix().set(3, 3, 0.0);
-  ASSERT_FALSE(uninvertible_transform.IsInvertible());
-
-  gfx::Transform identity_matrix;
-  Region touch_handler_region(gfx::Rect(10, 10, 50, 50));
-  gfx::PointF anchor;
-  gfx::PointF position;
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(root.get(),
-                               uninvertible_transform,
-                               anchor,
-                               position,
-                               bounds,
-                               true,
-                               false);
-  root->SetDrawsContent(true);
-  root->SetTouchEventHandlerRegion(touch_handler_region);
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-  ASSERT_FALSE(root->screen_space_transform().IsInvertible());
-
-  // Hit checking any point should not hit the touch handler region on the
-  // layer. If the invertible matrix is accidentally ignored and treated like an
-  // identity, then the hit testing will incorrectly hit the layer when it
-  // shouldn't.
-  gfx::Point test_point(1, 1);
-  LayerImpl* result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(10, 10);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(10, 30);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(50, 50);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(67, 48);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(99, 99);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(-1, -1);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-}
-
-TEST_F(LayerTreeHostCommonTest,
-     HitCheckingTouchHandlerRegionsForSinglePositionedLayer) {
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root =
-      LayerImpl::Create(host_impl.active_tree(), 12345);
-
-  gfx::Transform identity_matrix;
-  Region touch_handler_region(gfx::Rect(10, 10, 50, 50));
-  gfx::PointF anchor;
-  // this layer is positioned, and hit testing should correctly know where the
-  // layer is located.
-  gfx::PointF position(50.f, 50.f);
-  gfx::Size bounds(100, 100);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               position,
-                               bounds,
-                               true,
-                               false);
-  root->SetDrawsContent(true);
-  root->SetTouchEventHandlerRegion(touch_handler_region);
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-
-  // Hit checking for a point outside the layer should return a null pointer.
-  gfx::Point test_point(49, 49);
-  LayerImpl* result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Even though the layer has a touch handler region containing (101, 101), it
-  // should not be visible there since the root render surface would clamp it.
-  test_point = gfx::Point(101, 101);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit checking for a point inside the layer, but outside the touch handler
-  // region should return a null pointer.
-  test_point = gfx::Point(51, 51);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit checking for a point inside the touch event handler region should
-  // return the root layer.
-  test_point = gfx::Point(61, 61);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-
-  test_point = gfx::Point(99, 99);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest,
-     HitCheckingTouchHandlerRegionsForSingleLayerWithScaledContents) {
-  // A layer's visible content rect is actually in the layer's content space.
-  // The screen space transform converts from the layer's origin space to screen
-  // space. This test makes sure that hit testing works correctly accounts for
-  // the contents scale.  A contents scale that is not 1 effectively forces a
-  // non-identity transform between layer's content space and layer's origin
-  // space. The hit testing code must take this into account.
-  //
-  // To test this, the layer is positioned at (25, 25), and is size (50, 50). If
-  // contents scale is ignored, then hit checking will mis-interpret the visible
-  // content rect as being larger than the actual bounds of the layer.
-  //
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
-
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               gfx::PointF(),
-                               gfx::Size(100, 100),
-                               true,
-                               false);
-  {
-    Region touch_handler_region(gfx::Rect(10, 10, 30, 30));
-    gfx::PointF position(25.f, 25.f);
-    gfx::Size bounds(50, 50);
-    scoped_ptr<LayerImpl> test_layer =
-        LayerImpl::Create(host_impl.active_tree(), 12345);
-    SetLayerPropertiesForTesting(test_layer.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-
-    // override content bounds and contents scale
-    test_layer->SetContentBounds(gfx::Size(100, 100));
-    test_layer->SetContentsScale(2, 2);
-
-    test_layer->SetDrawsContent(true);
-    test_layer->SetTouchEventHandlerRegion(touch_handler_region);
-    root->AddChild(test_layer.Pass());
-  }
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  // The visible content rect for test_layer is actually 100x100, even though
-  // its layout size is 50x50, positioned at 25x25.
-  LayerImpl* test_layer = root->children()[0];
-  EXPECT_RECT_EQ(gfx::Rect(0, 0, 100, 100), test_layer->visible_content_rect());
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-
-  // Hit checking for a point outside the layer should return a null pointer
-  // (the root layer does not draw content, so it will not be tested either).
-  gfx::Point test_point(76, 76);
-  LayerImpl* result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit checking for a point inside the layer, but outside the touch handler
-  // region should return a null pointer.
-  test_point = gfx::Point(26, 26);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(34, 34);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(65, 65);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(74, 74);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit checking for a point inside the touch event handler region should
-  // return the root layer.
-  test_point = gfx::Point(35, 35);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-
-  test_point = gfx::Point(64, 64);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest,
-     HitCheckingTouchHandlerRegionsForSingleLayerWithDeviceScale) {
-  // The layer's device_scale_factor and page_scale_factor should scale the
-  // content rect and we should be able to hit the touch handler region by
-  // scaling the points accordingly.
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
-
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-  // Set the bounds of the root layer big enough to fit the child when scaled.
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               gfx::PointF(),
-                               gfx::Size(100, 100),
-                               true,
-                               false);
-  {
-    Region touch_handler_region(gfx::Rect(10, 10, 30, 30));
-    gfx::PointF position(25.f, 25.f);
-    gfx::Size bounds(50, 50);
-    scoped_ptr<LayerImpl> test_layer =
-        LayerImpl::Create(host_impl.active_tree(), 12345);
-    SetLayerPropertiesForTesting(test_layer.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-
-    test_layer->SetDrawsContent(true);
-    test_layer->SetTouchEventHandlerRegion(touch_handler_region);
-    root->AddChild(test_layer.Pass());
-  }
-
-  LayerImplList render_surface_layer_list;
-  float device_scale_factor = 3.f;
-  float page_scale_factor = 5.f;
-  gfx::Size scaled_bounds_for_root = gfx::ToCeiledSize(
-      gfx::ScaleSize(root->bounds(), device_scale_factor * page_scale_factor));
-
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), scaled_bounds_for_root, &render_surface_layer_list);
-  inputs.device_scale_factor = device_scale_factor;
-  inputs.page_scale_factor = page_scale_factor;
-  inputs.page_scale_application_layer = root.get();
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  // The visible content rect for test_layer is actually 100x100, even though
-  // its layout size is 50x50, positioned at 25x25.
-  LayerImpl* test_layer = root->children()[0];
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-
-  // Check whether the child layer fits into the root after scaled.
-  EXPECT_RECT_EQ(gfx::Rect(test_layer->content_bounds()),
-                 test_layer->visible_content_rect());
-
-  // Hit checking for a point outside the layer should return a null pointer
-  // (the root layer does not draw content, so it will not be tested either).
-  gfx::PointF test_point(76.f, 76.f);
-  test_point =
-      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
-  LayerImpl* result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit checking for a point inside the layer, but outside the touch handler
-  // region should return a null pointer.
-  test_point = gfx::Point(26, 26);
-  test_point =
-      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(34, 34);
-  test_point =
-      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(65, 65);
-  test_point =
-      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(74, 74);
-  test_point =
-      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit checking for a point inside the touch event handler region should
-  // return the root layer.
-  test_point = gfx::Point(35, 35);
-  test_point =
-      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-
-  test_point = gfx::Point(64, 64);
-  test_point =
-      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(12345, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest,
-     HitCheckingTouchHandlerRegionsForSimpleClippedLayer) {
-  // Test that hit-checking will only work for the visible portion of a layer,
-  // and not the entire layer bounds. Here we just test the simple axis-aligned
-  // case.
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               gfx::PointF(),
-                               gfx::Size(100, 100),
-                               true,
-                               false);
-  {
-    scoped_ptr<LayerImpl> clipping_layer =
-        LayerImpl::Create(host_impl.active_tree(), 123);
-    // this layer is positioned, and hit testing should correctly know where the
-    // layer is located.
-    gfx::PointF position(25.f, 25.f);
-    gfx::Size bounds(50, 50);
-    SetLayerPropertiesForTesting(clipping_layer.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    clipping_layer->SetMasksToBounds(true);
-
-    scoped_ptr<LayerImpl> child =
-        LayerImpl::Create(host_impl.active_tree(), 456);
-    Region touch_handler_region(gfx::Rect(10, 10, 50, 50));
-    position = gfx::PointF(-50.f, -50.f);
-    bounds = gfx::Size(300, 300);
-    SetLayerPropertiesForTesting(child.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    child->SetDrawsContent(true);
-    child->SetTouchEventHandlerRegion(touch_handler_region);
-    clipping_layer->AddChild(child.Pass());
-    root->AddChild(clipping_layer.Pass());
-  }
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(1u, root->render_surface()->layer_list().size());
-  ASSERT_EQ(456, root->render_surface()->layer_list().at(0)->id());
-
-  // Hit checking for a point outside the layer should return a null pointer.
-  // Despite the child layer being very large, it should be clipped to the root
-  // layer's bounds.
-  gfx::Point test_point(24, 24);
-  LayerImpl* result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit checking for a point inside the layer, but outside the touch handler
-  // region should return a null pointer.
-  test_point = gfx::Point(35, 35);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  test_point = gfx::Point(74, 74);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-
-  // Hit checking for a point inside the touch event handler region should
-  // return the root layer.
-  test_point = gfx::Point(25, 25);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(456, result_layer->id());
-
-  test_point = gfx::Point(34, 34);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(456, result_layer->id());
-}
-
-TEST_F(LayerTreeHostCommonTest,
-       HitCheckingTouchHandlerOverlappingRegions) {
-  gfx::Transform identity_matrix;
-  gfx::PointF anchor;
-
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
-  SetLayerPropertiesForTesting(root.get(),
-                               identity_matrix,
-                               anchor,
-                               gfx::PointF(),
-                               gfx::Size(100, 100),
-                               true,
-                               false);
-  {
-    scoped_ptr<LayerImpl> touch_layer =
-        LayerImpl::Create(host_impl.active_tree(), 123);
-    // this layer is positioned, and hit testing should correctly know where the
-    // layer is located.
-    gfx::PointF position;
-    gfx::Size bounds(50, 50);
-    SetLayerPropertiesForTesting(touch_layer.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    touch_layer->SetDrawsContent(true);
-    touch_layer->SetTouchEventHandlerRegion(gfx::Rect(0, 0, 50, 50));
-    root->AddChild(touch_layer.Pass());
-  }
-
-  {
-    scoped_ptr<LayerImpl> notouch_layer =
-        LayerImpl::Create(host_impl.active_tree(), 1234);
-    // this layer is positioned, and hit testing should correctly know where the
-    // layer is located.
-    gfx::PointF position(0, 25);
-    gfx::Size bounds(50, 50);
-    SetLayerPropertiesForTesting(notouch_layer.get(),
-                                 identity_matrix,
-                                 anchor,
-                                 position,
-                                 bounds,
-                                 true,
-                                 false);
-    notouch_layer->SetDrawsContent(true);
-    root->AddChild(notouch_layer.Pass());
-  }
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-  inputs.can_adjust_raster_scales = true;
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  // Sanity check the scenario we just created.
-  ASSERT_EQ(1u, render_surface_layer_list.size());
-  ASSERT_EQ(2u, root->render_surface()->layer_list().size());
-  ASSERT_EQ(123, root->render_surface()->layer_list().at(0)->id());
-  ASSERT_EQ(1234, root->render_surface()->layer_list().at(1)->id());
-
-  gfx::Point test_point(35, 35);
-  LayerImpl* result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-
-  // We should have passed through the no-touch layer and found the layer
-  // behind it.
-  EXPECT_TRUE(result_layer);
-
-  host_impl.active_tree()->LayerById(1234)->SetContentsOpaque(true);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-
-  // Even with an opaque layer in the middle, we should still find the layer
-  // with
-  // the touch handler behind it (since we can't assume that opaque layers are
-  // opaque to hit testing).
-  EXPECT_TRUE(result_layer);
-
-  test_point = gfx::Point(35, 15);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  ASSERT_TRUE(result_layer);
-  EXPECT_EQ(123, result_layer->id());
-
-  test_point = gfx::Point(35, 65);
-  result_layer =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          test_point, render_surface_layer_list);
-  EXPECT_FALSE(result_layer);
-}
-
 class NoScaleContentLayer : public ContentLayer {
  public:
   static scoped_refptr<NoScaleContentLayer> Create(ContentLayerClient* client) {
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 3683884..accd967 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -483,8 +483,8 @@ bool LayerTreeHostImpl::IsCurrentlyScrollingLayerAt(
   gfx::PointF device_viewport_point =
       gfx::ScalePoint(viewport_point, device_scale_factor_);
 
-  LayerImpl* layer_impl = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      device_viewport_point, active_tree_->RenderSurfaceLayerList());
+  LayerImpl* layer_impl =
+      active_tree_->FindLayerThatIsHitByPoint(device_viewport_point);
 
   bool scroll_on_main_thread = false;
   LayerImpl* scrolling_layer_impl = FindScrollLayerForDeviceViewportPoint(
@@ -503,9 +503,9 @@ bool LayerTreeHostImpl::HaveTouchEventHandlersAt(
       gfx::ScalePoint(viewport_point, device_scale_factor_);
 
   LayerImpl* layer_impl =
-      LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
-          device_viewport_point,
-          active_tree_->RenderSurfaceLayerList());
+      active_tree_->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          device_viewport_point);
+
   return layer_impl != NULL;
 }
 
@@ -2206,14 +2206,13 @@ InputHandler::ScrollStatus LayerTreeHostImpl::ScrollBegin(
 
   gfx::PointF device_viewport_point = gfx::ScalePoint(viewport_point,
                                                       device_scale_factor_);
-  LayerImpl* layer_impl = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      device_viewport_point,
-      active_tree_->RenderSurfaceLayerList());
+  LayerImpl* layer_impl =
+      active_tree_->FindLayerThatIsHitByPoint(device_viewport_point);
 
   if (layer_impl) {
     LayerImpl* scroll_layer_impl =
-        LayerTreeHostCommon::FindFirstScrollingLayerThatIsHitByPoint(
-            device_viewport_point, active_tree_->RenderSurfaceLayerList());
+        active_tree_->FindFirstScrollingLayerThatIsHitByPoint(
+            device_viewport_point);
     if (scroll_layer_impl && !HasScrollAncestor(layer_impl, scroll_layer_impl))
       return ScrollUnknown;
   }
@@ -2573,10 +2572,8 @@ void LayerTreeHostImpl::MouseMoveAt(const gfx::Point& viewport_point) {
 
   gfx::PointF device_viewport_point = gfx::ScalePoint(viewport_point,
                                                       device_scale_factor_);
-
-  LayerImpl* layer_impl = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
-      device_viewport_point,
-      active_tree_->RenderSurfaceLayerList());
+  LayerImpl* layer_impl =
+      active_tree_->FindLayerThatIsHitByPoint(device_viewport_point);
   if (HandleMouseOverScrollbar(layer_impl, device_viewport_point))
     return;
 
diff --git a/cc/trees/layer_tree_host_impl_unittest.cc b/cc/trees/layer_tree_host_impl_unittest.cc
index c262802..80f250e 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -6078,7 +6078,7 @@ TEST_F(LayerTreeHostImplTest, ScrollUnknownScrollAncestorMismatch) {
   occluder_layer->SetDrawsContent(true);
   occluder_layer->SetBounds(content_size);
   occluder_layer->SetContentBounds(content_size);
-  occluder_layer->SetPosition(gfx::PointF());
+  occluder_layer->SetPosition(gfx::PointF(-10.f, -10.f));
   occluder_layer->SetAnchorPoint(gfx::PointF());
 
   int child_scroll_clip_layer_id = 7;
@@ -6089,7 +6089,7 @@ TEST_F(LayerTreeHostImplTest, ScrollUnknownScrollAncestorMismatch) {
   scoped_ptr<LayerImpl> child_scroll = CreateScrollableLayer(
       child_scroll_layer_id, content_size, child_scroll_clip.get());
 
-  child_scroll->SetDrawsContent(false);
+  child_scroll->SetPosition(gfx::PointF(10.f, 10.f));
 
   child_scroll->AddChild(occluder_layer.Pass());
   scroll_layer->AddChild(child_scroll.Pass());
@@ -6100,6 +6100,95 @@ TEST_F(LayerTreeHostImplTest, ScrollUnknownScrollAncestorMismatch) {
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
 }
 
+TEST_F(LayerTreeHostImplTest, ScrollInvisibleScroller) {
+  gfx::Size content_size(100, 100);
+  SetupScrollAndContentsLayers(content_size);
+
+  LayerImpl* root = host_impl_->active_tree()->LayerById(1);
+
+  int scroll_layer_id = 2;
+  LayerImpl* scroll_layer =
+      host_impl_->active_tree()->LayerById(scroll_layer_id);
+
+  int child_scroll_layer_id = 7;
+  scoped_ptr<LayerImpl> child_scroll =
+      CreateScrollableLayer(child_scroll_layer_id, content_size, root);
+  child_scroll->SetDrawsContent(false);
+
+  scroll_layer->AddChild(child_scroll.Pass());
+
+  DrawFrame();
+
+  // We should not have scrolled |child_scroll| even though we technically "hit"
+  // it. The reason for this is that if the scrolling the scroll would not move
+  // any layer that is a drawn RSLL member, then we can ignore the hit.
+  //
+  // Why ScrollStarted? In this case, it's because we've bubbled out and started
+  // overscrolling the inner viewport.
+  EXPECT_EQ(InputHandler::ScrollStarted,
+            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
+
+  EXPECT_EQ(2, host_impl_->CurrentlyScrollingLayer()->id());
+}
+
+TEST_F(LayerTreeHostImplTest, ScrollInvisibleScrollerWithVisibleScrollChild) {
+  // This test case is very similar to the one above with one key difference:
+  // the invisible scroller has a scroll child that is indeed draw contents.
+  // If we attempt to initiate a gesture scroll off of the visible scroll child
+  // we should still start the scroll child.
+  gfx::Size content_size(100, 100);
+  SetupScrollAndContentsLayers(content_size);
+
+  LayerImpl* root = host_impl_->active_tree()->LayerById(1);
+
+  int scroll_layer_id = 2;
+  LayerImpl* scroll_layer =
+      host_impl_->active_tree()->LayerById(scroll_layer_id);
+
+  int scroll_child_id = 6;
+  scoped_ptr<LayerImpl> scroll_child =
+      LayerImpl::Create(host_impl_->active_tree(), scroll_child_id);
+  scroll_child->SetDrawsContent(true);
+  scroll_child->SetBounds(content_size);
+  scroll_child->SetContentBounds(content_size);
+  // Move the scroll child so it's not hit by our test point.
+  scroll_child->SetPosition(gfx::PointF(10.f, 10.f));
+  scroll_child->SetAnchorPoint(gfx::PointF());
+
+  int invisible_scroll_layer_id = 7;
+  scoped_ptr<LayerImpl> invisible_scroll =
+      CreateScrollableLayer(invisible_scroll_layer_id, content_size, root);
+  invisible_scroll->SetDrawsContent(false);
+
+  int container_id = 8;
+  scoped_ptr<LayerImpl> container =
+      LayerImpl::Create(host_impl_->active_tree(), container_id);
+
+  scoped_ptr<std::set<LayerImpl*> > scroll_children(new std::set<LayerImpl*>());
+  scroll_children->insert(scroll_child.get());
+  invisible_scroll->SetScrollChildren(scroll_children.release());
+
+  scroll_child->SetScrollParent(invisible_scroll.get());
+
+  container->AddChild(invisible_scroll.Pass());
+  container->AddChild(scroll_child.Pass());
+
+  scroll_layer->AddChild(container.Pass());
+
+  DrawFrame();
+
+  // We should not have scrolled |child_scroll| even though we technically "hit"
+  // it. The reason for this is that if the scrolling the scroll would not move
+  // any layer that is a drawn RSLL member, then we can ignore the hit.
+  //
+  // Why ScrollStarted? In this case, it's because we've bubbled out and started
+  // overscrolling the inner viewport.
+  EXPECT_EQ(InputHandler::ScrollStarted,
+            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
+
+  EXPECT_EQ(7, host_impl_->CurrentlyScrollingLayer()->id());
+}
+
 // Make sure LatencyInfo carried by LatencyInfoSwapPromise are passed
 // to CompositorFrameMetadata after SwapBuffers();
 TEST_F(LayerTreeHostImplTest, LatencyInfoPassedToCompositorFrameMetadata) {
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index 97e9c17..a4d5cab 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -4,6 +4,9 @@
 
 #include "cc/trees/layer_tree_impl.h"
 
+#include <limits>
+#include <set>
+
 #include "base/debug/trace_event.h"
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/animation/scrollbar_animation_controller.h"
@@ -20,6 +23,7 @@
 #include "cc/resources/ui_resource_request.h"
 #include "cc/trees/layer_tree_host_common.h"
 #include "cc/trees/layer_tree_host_impl.h"
+#include "ui/gfx/point_conversions.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/gfx/vector2d_conversions.h"
 
@@ -1022,4 +1026,262 @@ void LayerTreeImpl::ReleaseResourcesRecursive(LayerImpl* current) {
     ReleaseResourcesRecursive(current->children()[i]);
 }
 
+template <typename LayerType>
+static inline bool LayerClipsSubtree(LayerType* layer) {
+  return layer->masks_to_bounds() || layer->mask_layer();
+}
+
+static bool PointHitsRect(
+    const gfx::PointF& screen_space_point,
+    const gfx::Transform& local_space_to_screen_space_transform,
+    const gfx::RectF& local_space_rect,
+    float* distance_to_camera) {
+  // If the transform is not invertible, then assume that this point doesn't hit
+  // this rect.
+  gfx::Transform inverse_local_space_to_screen_space(
+      gfx::Transform::kSkipInitialization);
+  if (!local_space_to_screen_space_transform.GetInverse(
+          &inverse_local_space_to_screen_space))
+    return false;
+
+  // Transform the hit test point from screen space to the local space of the
+  // given rect.
+  bool clipped = false;
+  gfx::Point3F planar_point = MathUtil::ProjectPoint3D(
+      inverse_local_space_to_screen_space, screen_space_point, &clipped);
+  gfx::PointF hit_test_point_in_local_space =
+      gfx::PointF(planar_point.x(), planar_point.y());
+
+  // If ProjectPoint could not project to a valid value, then we assume that
+  // this point doesn't hit this rect.
+  if (clipped)
+    return false;
+
+  if (!local_space_rect.Contains(hit_test_point_in_local_space))
+    return false;
+
+  if (distance_to_camera) {
+    // To compute the distance to the camera, we have to take the planar point
+    // and pull it back to world space and compute the displacement along the
+    // z-axis.
+    gfx::Point3F planar_point_in_screen_space(planar_point);
+    local_space_to_screen_space_transform.TransformPoint(
+        &planar_point_in_screen_space);
+    *distance_to_camera = planar_point_in_screen_space.z();
+  }
+
+  return true;
+}
+
+static bool PointHitsRegion(const gfx::PointF& screen_space_point,
+                            const gfx::Transform& screen_space_transform,
+                            const Region& layer_space_region,
+                            float layer_content_scale_x,
+                            float layer_content_scale_y) {
+  // If the transform is not invertible, then assume that this point doesn't hit
+  // this region.
+  gfx::Transform inverse_screen_space_transform(
+      gfx::Transform::kSkipInitialization);
+  if (!screen_space_transform.GetInverse(&inverse_screen_space_transform))
+    return false;
+
+  // Transform the hit test point from screen space to the local space of the
+  // given region.
+  bool clipped = false;
+  gfx::PointF hit_test_point_in_content_space = MathUtil::ProjectPoint(
+      inverse_screen_space_transform, screen_space_point, &clipped);
+  gfx::PointF hit_test_point_in_layer_space =
+      gfx::ScalePoint(hit_test_point_in_content_space,
+                      1.f / layer_content_scale_x,
+                      1.f / layer_content_scale_y);
+
+  // If ProjectPoint could not project to a valid value, then we assume that
+  // this point doesn't hit this region.
+  if (clipped)
+    return false;
+
+  return layer_space_region.Contains(
+      gfx::ToRoundedPoint(hit_test_point_in_layer_space));
+}
+
+static bool PointIsClippedBySurfaceOrClipRect(
+    const gfx::PointF& screen_space_point,
+    LayerImpl* layer) {
+  LayerImpl* current_layer = layer;
+
+  // Walk up the layer tree and hit-test any render_surfaces and any layer
+  // clip rects that are active.
+  while (current_layer) {
+    if (current_layer->render_surface() &&
+        !PointHitsRect(
+            screen_space_point,
+            current_layer->render_surface()->screen_space_transform(),
+            current_layer->render_surface()->content_rect(),
+            NULL))
+      return true;
+
+    // Note that drawable content rects are actually in target surface space, so
+    // the transform we have to provide is the target surface's
+    // screen_space_transform.
+    LayerImpl* render_target = current_layer->render_target();
+    if (LayerClipsSubtree(current_layer) &&
+        !PointHitsRect(
+            screen_space_point,
+            render_target->render_surface()->screen_space_transform(),
+            current_layer->drawable_content_rect(),
+            NULL))
+      return true;
+
+    current_layer = current_layer->parent();
+  }
+
+  // If we have finished walking all ancestors without having already exited,
+  // then the point is not clipped by any ancestors.
+  return false;
+}
+
+static bool PointHitsLayer(LayerImpl* layer,
+                           const gfx::PointF& screen_space_point,
+                           float* distance_to_intersection) {
+  gfx::RectF content_rect(layer->content_bounds());
+  if (!PointHitsRect(screen_space_point,
+                     layer->screen_space_transform(),
+                     content_rect,
+                     distance_to_intersection))
+    return false;
+
+  // At this point, we think the point does hit the layer, but we need to walk
+  // up the parents to ensure that the layer was not clipped in such a way
+  // that the hit point actually should not hit the layer.
+  if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer))
+    return false;
+
+  // Skip the HUD layer.
+  if (layer == layer->layer_tree_impl()->hud_layer())
+    return false;
+
+  return true;
+}
+
+struct FindClosestMatchingLayerDataForRecursion {
+  FindClosestMatchingLayerDataForRecursion()
+      : closest_match(NULL),
+        closest_distance(-std::numeric_limits<float>::infinity()) {}
+  LayerImpl* closest_match;
+  // Note that the positive z-axis points towards the camera, so bigger means
+  // closer in this case, counterintuitively.
+  float closest_distance;
+};
+
+template <typename Functor>
+static void FindClosestMatchingLayer(
+    const gfx::PointF& screen_space_point,
+    LayerImpl* layer,
+    const Functor& func,
+    FindClosestMatchingLayerDataForRecursion* data_for_recursion) {
+  for (int i = layer->children().size() - 1; i >= 0; --i) {
+    FindClosestMatchingLayer(
+        screen_space_point, layer->children()[i], func, data_for_recursion);
+  }
+
+  float distance_to_intersection = 0.f;
+  if (func(layer) &&
+      PointHitsLayer(layer, screen_space_point, &distance_to_intersection) &&
+      ((!data_for_recursion->closest_match ||
+        distance_to_intersection > data_for_recursion->closest_distance))) {
+    data_for_recursion->closest_distance = distance_to_intersection;
+    data_for_recursion->closest_match = layer;
+  }
+}
+
+static bool ScrollsAnyDrawnRenderSurfaceLayerListMember(LayerImpl* layer) {
+  if (!layer->scrollable())
+    return false;
+  if (layer->IsDrawnRenderSurfaceLayerListMember())
+    return true;
+  if (!layer->scroll_children())
+    return false;
+  for (std::set<LayerImpl*>::const_iterator it =
+           layer->scroll_children()->begin();
+       it != layer->scroll_children()->end();
+       ++it) {
+    if ((*it)->IsDrawnRenderSurfaceLayerListMember())
+      return true;
+  }
+  return false;
+}
+
+struct FindScrollingLayerFunctor {
+  bool operator()(LayerImpl* layer) const {
+    return ScrollsAnyDrawnRenderSurfaceLayerListMember(layer);
+  }
+};
+
+LayerImpl* LayerTreeImpl::FindFirstScrollingLayerThatIsHitByPoint(
+    const gfx::PointF& screen_space_point) {
+  FindClosestMatchingLayerDataForRecursion data_for_recursion;
+  FindClosestMatchingLayer(screen_space_point,
+                           root_layer(),
+                           FindScrollingLayerFunctor(),
+                           &data_for_recursion);
+  return data_for_recursion.closest_match;
+}
+
+struct HitTestVisibleScrollableOrTouchableFunctor {
+  bool operator()(LayerImpl* layer) const {
+    return layer->IsDrawnRenderSurfaceLayerListMember() ||
+           ScrollsAnyDrawnRenderSurfaceLayerListMember(layer) ||
+           !layer->touch_event_handler_region().IsEmpty() ||
+           layer->have_wheel_event_handlers();
+  }
+};
+
+LayerImpl* LayerTreeImpl::FindLayerThatIsHitByPoint(
+    const gfx::PointF& screen_space_point) {
+  FindClosestMatchingLayerDataForRecursion data_for_recursion;
+  FindClosestMatchingLayer(screen_space_point,
+                           root_layer(),
+                           HitTestVisibleScrollableOrTouchableFunctor(),
+                           &data_for_recursion);
+  return data_for_recursion.closest_match;
+}
+
+static bool LayerHasTouchEventHandlersAt(const gfx::PointF& screen_space_point,
+                                         LayerImpl* layer_impl) {
+  if (layer_impl->touch_event_handler_region().IsEmpty())
+    return false;
+
+  if (!PointHitsRegion(screen_space_point,
+                       layer_impl->screen_space_transform(),
+                       layer_impl->touch_event_handler_region(),
+                       layer_impl->contents_scale_x(),
+                       layer_impl->contents_scale_y()))
+    return false;
+
+  // At this point, we think the point does hit the touch event handler region
+  // on the layer, but we need to walk up the parents to ensure that the layer
+  // was not clipped in such a way that the hit point actually should not hit
+  // the layer.
+  if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer_impl))
+    return false;
+
+  return true;
+}
+
+struct FindTouchEventLayerFunctor {
+  bool operator()(LayerImpl* layer) const {
+    return LayerHasTouchEventHandlersAt(screen_space_point, layer);
+  }
+  const gfx::PointF screen_space_point;
+};
+
+LayerImpl* LayerTreeImpl::FindLayerThatIsHitByPointInTouchHandlerRegion(
+    const gfx::PointF& screen_space_point) {
+  FindTouchEventLayerFunctor func = {screen_space_point};
+  FindClosestMatchingLayerDataForRecursion data_for_recursion;
+  FindClosestMatchingLayer(
+      screen_space_point, root_layer(), func, &data_for_recursion);
+  return data_for_recursion.closest_match;
+}
+
 }  // namespace cc
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index 4330213..5b740c3 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -252,6 +252,14 @@ class CC_EXPORT LayerTreeImpl {
     return render_surface_layer_list_id_;
   }
 
+  LayerImpl* FindFirstScrollingLayerThatIsHitByPoint(
+      const gfx::PointF& screen_space_point);
+
+  LayerImpl* FindLayerThatIsHitByPoint(const gfx::PointF& screen_space_point);
+
+  LayerImpl* FindLayerThatIsHitByPointInTouchHandlerRegion(
+      const gfx::PointF& screen_space_point);
+
  protected:
   explicit LayerTreeImpl(LayerTreeHostImpl* layer_tree_host_impl);
   void ReleaseResourcesRecursive(LayerImpl* current);
diff --git a/cc/trees/layer_tree_impl_unittest.cc b/cc/trees/layer_tree_impl_unittest.cc
new file mode 100644
index 0000000..b27a06e
--- /dev/null
+++ b/cc/trees/layer_tree_impl_unittest.cc
@@ -0,0 +1,1940 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/trees/layer_tree_impl.h"
+
+#include "cc/layers/heads_up_display_layer_impl.h"
+#include "cc/layers/layer.h"
+#include "cc/test/fake_impl_proxy.h"
+#include "cc/test/fake_layer_tree_host_impl.h"
+#include "cc/test/fake_output_surface.h"
+#include "cc/test/geometry_test_utils.h"
+#include "cc/test/layer_tree_host_common_test.h"
+#include "cc/test/test_shared_bitmap_manager.h"
+#include "cc/trees/layer_tree_host_impl.h"
+#include "ui/gfx/size_conversions.h"
+
+namespace cc {
+namespace {
+
+class LayerTreeImplTest : public LayerTreeHostCommonTest {
+ public:
+  LayerTreeImplTest() {
+    LayerTreeSettings settings;
+    settings.layer_transforms_should_scale_layer_contents = true;
+    host_impl_.reset(
+        new FakeLayerTreeHostImpl(settings, &proxy_, &shared_bitmap_manager_));
+    EXPECT_TRUE(host_impl_->InitializeRenderer(
+        FakeOutputSurface::Create3d().PassAs<OutputSurface>()));
+  }
+
+  FakeLayerTreeHostImpl& host_impl() { return *host_impl_; }
+
+  LayerImpl* root_layer() { return host_impl_->active_tree()->root_layer(); }
+
+  const LayerImplList& RenderSurfaceLayerList() const {
+    return host_impl_->active_tree()->RenderSurfaceLayerList();
+  }
+
+ private:
+  TestSharedBitmapManager shared_bitmap_manager_;
+  FakeImplProxy proxy_;
+  scoped_ptr<FakeLayerTreeHostImpl> host_impl_;
+};
+
+TEST_F(LayerTreeImplTest, HitTestingForSingleLayer) {
+  scoped_ptr<LayerImpl> root =
+      LayerImpl::Create(host_impl().active_tree(), 12345);
+
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(
+      root.get(), identity_matrix, anchor, position, bounds, true, false);
+  root->SetDrawsContent(true);
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+
+  // Hit testing for a point outside the layer should return a null pointer.
+  gfx::Point test_point(101, 101);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(-1, -1);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit testing for a point inside should return the root layer.
+  test_point = gfx::Point(1, 1);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+
+  test_point = gfx::Point(99, 99);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForSingleLayerAndHud) {
+  scoped_ptr<LayerImpl> root =
+      LayerImpl::Create(host_impl().active_tree(), 12345);
+  scoped_ptr<HeadsUpDisplayLayerImpl> hud =
+      HeadsUpDisplayLayerImpl::Create(host_impl().active_tree(), 11111);
+
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(
+      root.get(), identity_matrix, anchor, position, bounds, true, false);
+  root->SetDrawsContent(true);
+
+  // Create hud and add it as a child of root.
+  gfx::Size hud_bounds(200, 200);
+  SetLayerPropertiesForTesting(
+      hud.get(), identity_matrix, anchor, position, hud_bounds, true, false);
+  hud->SetDrawsContent(true);
+
+  host_impl().active_tree()->set_hud_layer(hud.get());
+  root->AddChild(hud.PassAs<LayerImpl>());
+
+  host_impl().SetViewportSize(hud_bounds);
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(2u, root_layer()->render_surface()->layer_list().size());
+
+  // Hit testing for a point inside HUD, but outside root should return null
+  gfx::Point test_point(101, 101);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(-1, -1);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit testing for a point inside should return the root layer, never the HUD
+  // layer.
+  test_point = gfx::Point(1, 1);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+
+  test_point = gfx::Point(99, 99);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForUninvertibleTransform) {
+  scoped_ptr<LayerImpl> root =
+      LayerImpl::Create(host_impl().active_tree(), 12345);
+
+  gfx::Transform uninvertible_transform;
+  uninvertible_transform.matrix().set(0, 0, 0.0);
+  uninvertible_transform.matrix().set(1, 1, 0.0);
+  uninvertible_transform.matrix().set(2, 2, 0.0);
+  uninvertible_transform.matrix().set(3, 3, 0.0);
+  ASSERT_FALSE(uninvertible_transform.IsInvertible());
+
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(root.get(),
+                               uninvertible_transform,
+                               anchor,
+                               position,
+                               bounds,
+                               true,
+                               false);
+  root->SetDrawsContent(true);
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+  ASSERT_FALSE(root_layer()->screen_space_transform().IsInvertible());
+
+  // Hit testing any point should not hit the layer. If the invertible matrix is
+  // accidentally ignored and treated like an identity, then the hit testing
+  // will incorrectly hit the layer when it shouldn't.
+  gfx::Point test_point(1, 1);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(10, 10);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(10, 30);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(50, 50);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(67, 48);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(99, 99);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(-1, -1);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForSinglePositionedLayer) {
+  scoped_ptr<LayerImpl> root =
+      LayerImpl::Create(host_impl().active_tree(), 12345);
+
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+  // this layer is positioned, and hit testing should correctly know where the
+  // layer is located.
+  gfx::PointF position(50.f, 50.f);
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(
+      root.get(), identity_matrix, anchor, position, bounds, true, false);
+  root->SetDrawsContent(true);
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+
+  // Hit testing for a point outside the layer should return a null pointer.
+  gfx::Point test_point(49, 49);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Even though the layer exists at (101, 101), it should not be visible there
+  // since the root render surface would clamp it.
+  test_point = gfx::Point(101, 101);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit testing for a point inside should return the root layer.
+  test_point = gfx::Point(51, 51);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+
+  test_point = gfx::Point(99, 99);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForSingleRotatedLayer) {
+  scoped_ptr<LayerImpl> root =
+      LayerImpl::Create(host_impl().active_tree(), 12345);
+
+  gfx::Transform identity_matrix;
+  gfx::Transform rotation45_degrees_about_center;
+  rotation45_degrees_about_center.Translate(50.0, 50.0);
+  rotation45_degrees_about_center.RotateAboutZAxis(45.0);
+  rotation45_degrees_about_center.Translate(-50.0, -50.0);
+  gfx::PointF anchor;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(root.get(),
+                               rotation45_degrees_about_center,
+                               anchor,
+                               position,
+                               bounds,
+                               true,
+                               false);
+  root->SetDrawsContent(true);
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+
+  // Hit testing for points outside the layer.
+  // These corners would have been inside the un-transformed layer, but they
+  // should not hit the correctly transformed layer.
+  gfx::Point test_point(99, 99);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(1, 1);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit testing for a point inside should return the root layer.
+  test_point = gfx::Point(1, 50);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+
+  // Hit testing the corners that would overlap the unclipped layer, but are
+  // outside the clipped region.
+  test_point = gfx::Point(50, -1);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_FALSE(result_layer);
+
+  test_point = gfx::Point(-1, 50);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_FALSE(result_layer);
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForSinglePerspectiveLayer) {
+  scoped_ptr<LayerImpl> root =
+      LayerImpl::Create(host_impl().active_tree(), 12345);
+
+  gfx::Transform identity_matrix;
+
+  // perspective_projection_about_center * translation_by_z is designed so that
+  // the 100 x 100 layer becomes 50 x 50, and remains centered at (50, 50).
+  gfx::Transform perspective_projection_about_center;
+  perspective_projection_about_center.Translate(50.0, 50.0);
+  perspective_projection_about_center.ApplyPerspectiveDepth(1.0);
+  perspective_projection_about_center.Translate(-50.0, -50.0);
+  gfx::Transform translation_by_z;
+  translation_by_z.Translate3d(0.0, 0.0, -1.0);
+
+  gfx::PointF anchor;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(
+      root.get(),
+      perspective_projection_about_center * translation_by_z,
+      anchor,
+      position,
+      bounds,
+      true,
+      false);
+  root->SetDrawsContent(true);
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+
+  // Hit testing for points outside the layer.
+  // These corners would have been inside the un-transformed layer, but they
+  // should not hit the correctly transformed layer.
+  gfx::Point test_point(24, 24);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(76, 76);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit testing for a point inside should return the root layer.
+  test_point = gfx::Point(26, 26);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+
+  test_point = gfx::Point(74, 74);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForSingleLayerWithScaledContents) {
+  // A layer's visible content rect is actually in the layer's content space.
+  // The screen space transform converts from the layer's origin space to screen
+  // space. This test makes sure that hit testing works correctly accounts for
+  // the contents scale.  A contents scale that is not 1 effectively forces a
+  // non-identity transform between layer's content space and layer's origin
+  // space. The hit testing code must take this into account.
+  //
+  // To test this, the layer is positioned at (25, 25), and is size (50, 50). If
+  // contents scale is ignored, then hit testing will mis-interpret the visible
+  // content rect as being larger than the actual bounds of the layer.
+  //
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 1);
+
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+
+  SetLayerPropertiesForTesting(root.get(),
+                               identity_matrix,
+                               anchor,
+                               gfx::PointF(),
+                               gfx::Size(100, 100),
+                               true,
+                               false);
+  {
+    gfx::PointF position(25.f, 25.f);
+    gfx::Size bounds(50, 50);
+    scoped_ptr<LayerImpl> test_layer =
+        LayerImpl::Create(host_impl().active_tree(), 12345);
+    SetLayerPropertiesForTesting(test_layer.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+
+    // override content bounds and contents scale
+    test_layer->SetContentBounds(gfx::Size(100, 100));
+    test_layer->SetContentsScale(2, 2);
+
+    test_layer->SetDrawsContent(true);
+    root->AddChild(test_layer.Pass());
+  }
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  // The visible content rect for test_layer is actually 100x100, even though
+  // its layout size is 50x50, positioned at 25x25.
+  LayerImpl* test_layer =
+      host_impl().active_tree()->root_layer()->children()[0];
+  EXPECT_RECT_EQ(gfx::Rect(0, 0, 100, 100), test_layer->visible_content_rect());
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+
+  // Hit testing for a point outside the layer should return a null pointer (the
+  // root layer does not draw content, so it will not be hit tested either).
+  gfx::Point test_point(101, 101);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(24, 24);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(76, 76);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit testing for a point inside should return the test layer.
+  test_point = gfx::Point(26, 26);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+
+  test_point = gfx::Point(74, 74);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForSimpleClippedLayer) {
+  // Test that hit-testing will only work for the visible portion of a layer,
+  // and not the entire layer bounds. Here we just test the simple axis-aligned
+  // case.
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 1);
+  SetLayerPropertiesForTesting(root.get(),
+                               identity_matrix,
+                               anchor,
+                               gfx::PointF(),
+                               gfx::Size(100, 100),
+                               true,
+                               false);
+  {
+    scoped_ptr<LayerImpl> clipping_layer =
+        LayerImpl::Create(host_impl().active_tree(), 123);
+    // this layer is positioned, and hit testing should correctly know where the
+    // layer is located.
+    gfx::PointF position(25.f, 25.f);
+    gfx::Size bounds(50, 50);
+    SetLayerPropertiesForTesting(clipping_layer.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+    clipping_layer->SetMasksToBounds(true);
+
+    scoped_ptr<LayerImpl> child =
+        LayerImpl::Create(host_impl().active_tree(), 456);
+    position = gfx::PointF(-50.f, -50.f);
+    bounds = gfx::Size(300, 300);
+    SetLayerPropertiesForTesting(
+        child.get(), identity_matrix, anchor, position, bounds, true, false);
+    child->SetDrawsContent(true);
+    clipping_layer->AddChild(child.Pass());
+    root->AddChild(clipping_layer.Pass());
+  }
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+  ASSERT_EQ(456, root_layer()->render_surface()->layer_list().at(0)->id());
+
+  // Hit testing for a point outside the layer should return a null pointer.
+  // Despite the child layer being very large, it should be clipped to the root
+  // layer's bounds.
+  gfx::Point test_point(24, 24);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Even though the layer exists at (101, 101), it should not be visible there
+  // since the clipping_layer would clamp it.
+  test_point = gfx::Point(76, 76);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit testing for a point inside should return the child layer.
+  test_point = gfx::Point(26, 26);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(456, result_layer->id());
+
+  test_point = gfx::Point(74, 74);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(456, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForMultiClippedRotatedLayer) {
+  // This test checks whether hit testing correctly avoids hit testing with
+  // multiple ancestors that clip in non axis-aligned ways. To pass this test,
+  // the hit testing algorithm needs to recognize that multiple parent layers
+  // may clip the layer, and should not actually hit those clipped areas.
+  //
+  // The child and grand_child layers are both initialized to clip the
+  // rotated_leaf. The child layer is rotated about the top-left corner, so that
+  // the root + child clips combined create a triangle. The rotated_leaf will
+  // only be visible where it overlaps this triangle.
+  //
+  scoped_ptr<LayerImpl> root =
+      LayerImpl::Create(host_impl().active_tree(), 123);
+
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(
+      root.get(), identity_matrix, anchor, position, bounds, true, false);
+  root->SetMasksToBounds(true);
+  {
+    scoped_ptr<LayerImpl> child =
+        LayerImpl::Create(host_impl().active_tree(), 456);
+    scoped_ptr<LayerImpl> grand_child =
+        LayerImpl::Create(host_impl().active_tree(), 789);
+    scoped_ptr<LayerImpl> rotated_leaf =
+        LayerImpl::Create(host_impl().active_tree(), 2468);
+
+    position = gfx::PointF(10.f, 10.f);
+    bounds = gfx::Size(80, 80);
+    SetLayerPropertiesForTesting(
+        child.get(), identity_matrix, anchor, position, bounds, true, false);
+    child->SetMasksToBounds(true);
+
+    gfx::Transform rotation45_degrees_about_corner;
+    rotation45_degrees_about_corner.RotateAboutZAxis(45.0);
+
+    // remember, positioned with respect to its parent which is already at 10,
+    // 10
+    position = gfx::PointF();
+    bounds =
+        gfx::Size(200, 200);  // to ensure it covers at least sqrt(2) * 100.
+    SetLayerPropertiesForTesting(grand_child.get(),
+                                 rotation45_degrees_about_corner,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+    grand_child->SetMasksToBounds(true);
+
+    // Rotates about the center of the layer
+    gfx::Transform rotated_leaf_transform;
+    rotated_leaf_transform.Translate(
+        -10.0, -10.0);  // cancel out the grand_parent's position
+    rotated_leaf_transform.RotateAboutZAxis(
+        -45.0);  // cancel out the corner 45-degree rotation of the parent.
+    rotated_leaf_transform.Translate(50.0, 50.0);
+    rotated_leaf_transform.RotateAboutZAxis(45.0);
+    rotated_leaf_transform.Translate(-50.0, -50.0);
+    position = gfx::PointF();
+    bounds = gfx::Size(100, 100);
+    SetLayerPropertiesForTesting(rotated_leaf.get(),
+                                 rotated_leaf_transform,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+    rotated_leaf->SetDrawsContent(true);
+
+    grand_child->AddChild(rotated_leaf.Pass());
+    child->AddChild(grand_child.Pass());
+    root->AddChild(child.Pass());
+  }
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  // The grand_child is expected to create a render surface because it
+  // MasksToBounds and is not axis aligned.
+  ASSERT_EQ(2u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(
+      1u,
+      RenderSurfaceLayerList().at(0)->render_surface()->layer_list().size());
+  ASSERT_EQ(789,
+            RenderSurfaceLayerList()
+                .at(0)
+                ->render_surface()
+                ->layer_list()
+                .at(0)
+                ->id());  // grand_child's surface.
+  ASSERT_EQ(
+      1u,
+      RenderSurfaceLayerList().at(1)->render_surface()->layer_list().size());
+  ASSERT_EQ(
+      2468,
+      RenderSurfaceLayerList()[1]->render_surface()->layer_list().at(0)->id());
+
+  // (11, 89) is close to the the bottom left corner within the clip, but it is
+  // not inside the layer.
+  gfx::Point test_point(11, 89);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Closer inwards from the bottom left will overlap the layer.
+  test_point = gfx::Point(25, 75);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(2468, result_layer->id());
+
+  // (4, 50) is inside the unclipped layer, but that corner of the layer should
+  // be clipped away by the grandparent and should not get hit. If hit testing
+  // blindly uses visible content rect without considering how parent may clip
+  // the layer, then hit testing would accidentally think that the point
+  // successfully hits the layer.
+  test_point = gfx::Point(4, 50);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // (11, 50) is inside the layer and within the clipped area.
+  test_point = gfx::Point(11, 50);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(2468, result_layer->id());
+
+  // Around the middle, just to the right and up, would have hit the layer
+  // except that that area should be clipped away by the parent.
+  test_point = gfx::Point(51, 49);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Around the middle, just to the left and down, should successfully hit the
+  // layer.
+  test_point = gfx::Point(49, 51);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(2468, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForNonClippingIntermediateLayer) {
+  // This test checks that hit testing code does not accidentally clip to layer
+  // bounds for a layer that actually does not clip.
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 1);
+  SetLayerPropertiesForTesting(root.get(),
+                               identity_matrix,
+                               anchor,
+                               gfx::PointF(),
+                               gfx::Size(100, 100),
+                               true,
+                               false);
+  {
+    scoped_ptr<LayerImpl> intermediate_layer =
+        LayerImpl::Create(host_impl().active_tree(), 123);
+    // this layer is positioned, and hit testing should correctly know where the
+    // layer is located.
+    gfx::PointF position(10.f, 10.f);
+    gfx::Size bounds(50, 50);
+    SetLayerPropertiesForTesting(intermediate_layer.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+    // Sanity check the intermediate layer should not clip.
+    ASSERT_FALSE(intermediate_layer->masks_to_bounds());
+    ASSERT_FALSE(intermediate_layer->mask_layer());
+
+    // The child of the intermediate_layer is translated so that it does not
+    // overlap intermediate_layer at all.  If child is incorrectly clipped, we
+    // would not be able to hit it successfully.
+    scoped_ptr<LayerImpl> child =
+        LayerImpl::Create(host_impl().active_tree(), 456);
+    position = gfx::PointF(60.f, 60.f);  // 70, 70 in screen space
+    bounds = gfx::Size(20, 20);
+    SetLayerPropertiesForTesting(
+        child.get(), identity_matrix, anchor, position, bounds, true, false);
+    child->SetDrawsContent(true);
+    intermediate_layer->AddChild(child.Pass());
+    root->AddChild(intermediate_layer.Pass());
+  }
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+  ASSERT_EQ(456, root_layer()->render_surface()->layer_list().at(0)->id());
+
+  // Hit testing for a point outside the layer should return a null pointer.
+  gfx::Point test_point(69, 69);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(91, 91);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit testing for a point inside should return the child layer.
+  test_point = gfx::Point(71, 71);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(456, result_layer->id());
+
+  test_point = gfx::Point(89, 89);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(456, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForMultipleLayers) {
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 1);
+
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(
+      root.get(), identity_matrix, anchor, position, bounds, true, false);
+  root->SetDrawsContent(true);
+  {
+    // child 1 and child2 are initialized to overlap between x=50 and x=60.
+    // grand_child is set to overlap both child1 and child2 between y=50 and
+    // y=60.  The expected stacking order is: (front) child2, (second)
+    // grand_child, (third) child1, and (back) the root layer behind all other
+    // layers.
+
+    scoped_ptr<LayerImpl> child1 =
+        LayerImpl::Create(host_impl().active_tree(), 2);
+    scoped_ptr<LayerImpl> child2 =
+        LayerImpl::Create(host_impl().active_tree(), 3);
+    scoped_ptr<LayerImpl> grand_child1 =
+        LayerImpl::Create(host_impl().active_tree(), 4);
+
+    position = gfx::PointF(10.f, 10.f);
+    bounds = gfx::Size(50, 50);
+    SetLayerPropertiesForTesting(
+        child1.get(), identity_matrix, anchor, position, bounds, true, false);
+    child1->SetDrawsContent(true);
+
+    position = gfx::PointF(50.f, 10.f);
+    bounds = gfx::Size(50, 50);
+    SetLayerPropertiesForTesting(
+        child2.get(), identity_matrix, anchor, position, bounds, true, false);
+    child2->SetDrawsContent(true);
+
+    // Remember that grand_child is positioned with respect to its parent (i.e.
+    // child1).  In screen space, the intended position is (10, 50), with size
+    // 100 x 50.
+    position = gfx::PointF(0.f, 40.f);
+    bounds = gfx::Size(100, 50);
+    SetLayerPropertiesForTesting(grand_child1.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+    grand_child1->SetDrawsContent(true);
+
+    child1->AddChild(grand_child1.Pass());
+    root->AddChild(child1.Pass());
+    root->AddChild(child2.Pass());
+  }
+
+  LayerImpl* child1 = root->children()[0];
+  LayerImpl* child2 = root->children()[1];
+  LayerImpl* grand_child1 = child1->children()[0];
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_TRUE(child1);
+  ASSERT_TRUE(child2);
+  ASSERT_TRUE(grand_child1);
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+
+  RenderSurfaceImpl* root_render_surface = root_layer()->render_surface();
+  ASSERT_EQ(4u, root_render_surface->layer_list().size());
+  ASSERT_EQ(1, root_render_surface->layer_list().at(0)->id());  // root layer
+  ASSERT_EQ(2, root_render_surface->layer_list().at(1)->id());  // child1
+  ASSERT_EQ(4, root_render_surface->layer_list().at(2)->id());  // grand_child1
+  ASSERT_EQ(3, root_render_surface->layer_list().at(3)->id());  // child2
+
+  // Nothing overlaps the root_layer at (1, 1), so hit testing there should find
+  // the root layer.
+  gfx::Point test_point = gfx::Point(1, 1);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(1, result_layer->id());
+
+  // At (15, 15), child1 and root are the only layers. child1 is expected to be
+  // on top.
+  test_point = gfx::Point(15, 15);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(2, result_layer->id());
+
+  // At (51, 20), child1 and child2 overlap. child2 is expected to be on top.
+  test_point = gfx::Point(51, 20);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(3, result_layer->id());
+
+  // At (80, 51), child2 and grand_child1 overlap. child2 is expected to be on
+  // top.
+  test_point = gfx::Point(80, 51);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(3, result_layer->id());
+
+  // At (51, 51), all layers overlap each other. child2 is expected to be on top
+  // of all other layers.
+  test_point = gfx::Point(51, 51);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(3, result_layer->id());
+
+  // At (20, 51), child1 and grand_child1 overlap. grand_child1 is expected to
+  // be on top.
+  test_point = gfx::Point(20, 51);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(4, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForMultipleLayersAtVaryingDepths) {
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 1);
+
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(
+      root.get(), identity_matrix, anchor, position, bounds, true, false);
+  root->SetDrawsContent(true);
+  root->SetShouldFlattenTransform(false);
+  root->SetIs3dSorted(true);
+  {
+    // child 1 and child2 are initialized to overlap between x=50 and x=60.
+    // grand_child is set to overlap both child1 and child2 between y=50 and
+    // y=60.  The expected stacking order is: (front) child2, (second)
+    // grand_child, (third) child1, and (back) the root layer behind all other
+    // layers.
+
+    scoped_ptr<LayerImpl> child1 =
+        LayerImpl::Create(host_impl().active_tree(), 2);
+    scoped_ptr<LayerImpl> child2 =
+        LayerImpl::Create(host_impl().active_tree(), 3);
+    scoped_ptr<LayerImpl> grand_child1 =
+        LayerImpl::Create(host_impl().active_tree(), 4);
+
+    position = gfx::PointF(10.f, 10.f);
+    bounds = gfx::Size(50, 50);
+    SetLayerPropertiesForTesting(
+        child1.get(), identity_matrix, anchor, position, bounds, true, false);
+    child1->SetDrawsContent(true);
+    child1->SetShouldFlattenTransform(false);
+    child1->SetIs3dSorted(true);
+
+    position = gfx::PointF(50.f, 10.f);
+    bounds = gfx::Size(50, 50);
+    gfx::Transform translate_z;
+    translate_z.Translate3d(0, 0, -10.f);
+    SetLayerPropertiesForTesting(
+        child2.get(), translate_z, anchor, position, bounds, true, false);
+    child2->SetDrawsContent(true);
+    child2->SetShouldFlattenTransform(false);
+    child2->SetIs3dSorted(true);
+
+    // Remember that grand_child is positioned with respect to its parent (i.e.
+    // child1).  In screen space, the intended position is (10, 50), with size
+    // 100 x 50.
+    position = gfx::PointF(0.f, 40.f);
+    bounds = gfx::Size(100, 50);
+    SetLayerPropertiesForTesting(grand_child1.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+    grand_child1->SetDrawsContent(true);
+    grand_child1->SetShouldFlattenTransform(false);
+
+    child1->AddChild(grand_child1.Pass());
+    root->AddChild(child1.Pass());
+    root->AddChild(child2.Pass());
+  }
+
+  LayerImpl* child1 = root->children()[0];
+  LayerImpl* child2 = root->children()[1];
+  LayerImpl* grand_child1 = child1->children()[0];
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_TRUE(child1);
+  ASSERT_TRUE(child2);
+  ASSERT_TRUE(grand_child1);
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+
+  RenderSurfaceImpl* root_render_surface =
+      host_impl().active_tree()->root_layer()->render_surface();
+  ASSERT_EQ(4u, root_render_surface->layer_list().size());
+  ASSERT_EQ(3, root_render_surface->layer_list().at(0)->id());
+  ASSERT_EQ(1, root_render_surface->layer_list().at(1)->id());
+  ASSERT_EQ(2, root_render_surface->layer_list().at(2)->id());
+  ASSERT_EQ(4, root_render_surface->layer_list().at(3)->id());
+
+  // Nothing overlaps the root_layer at (1, 1), so hit testing there should find
+  // the root layer.
+  gfx::Point test_point = gfx::Point(1, 1);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(1, result_layer->id());
+
+  // At (15, 15), child1 and root are the only layers. child1 is expected to be
+  // on top.
+  test_point = gfx::Point(15, 15);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(2, result_layer->id());
+
+  // At (51, 20), child1 and child2 overlap. child2 is expected to be on top.
+  // (because 3 is transformed to the back).
+  test_point = gfx::Point(51, 20);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(2, result_layer->id());
+
+  // 3 Would have been on top if it hadn't been transformed to the background.
+  // Make sure that it isn't hit.
+  test_point = gfx::Point(80, 51);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(4, result_layer->id());
+
+  // 3 Would have been on top if it hadn't been transformed to the background.
+  // Make sure that it isn't hit.
+  test_point = gfx::Point(51, 51);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(4, result_layer->id());
+
+  // At (20, 51), child1 and grand_child1 overlap. grand_child1 is expected to
+  // be on top.
+  test_point = gfx::Point(20, 51);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(4, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForMultipleLayerLists) {
+  //
+  // The geometry is set up similarly to the previous case, but
+  // all layers are forced to be render surfaces now.
+  //
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 1);
+
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(
+      root.get(), identity_matrix, anchor, position, bounds, true, false);
+  root->SetDrawsContent(true);
+  {
+    // child 1 and child2 are initialized to overlap between x=50 and x=60.
+    // grand_child is set to overlap both child1 and child2 between y=50 and
+    // y=60.  The expected stacking order is: (front) child2, (second)
+    // grand_child, (third) child1, and (back) the root layer behind all other
+    // layers.
+
+    scoped_ptr<LayerImpl> child1 =
+        LayerImpl::Create(host_impl().active_tree(), 2);
+    scoped_ptr<LayerImpl> child2 =
+        LayerImpl::Create(host_impl().active_tree(), 3);
+    scoped_ptr<LayerImpl> grand_child1 =
+        LayerImpl::Create(host_impl().active_tree(), 4);
+
+    position = gfx::PointF(10.f, 10.f);
+    bounds = gfx::Size(50, 50);
+    SetLayerPropertiesForTesting(
+        child1.get(), identity_matrix, anchor, position, bounds, true, false);
+    child1->SetDrawsContent(true);
+    child1->SetForceRenderSurface(true);
+
+    position = gfx::PointF(50.f, 10.f);
+    bounds = gfx::Size(50, 50);
+    SetLayerPropertiesForTesting(
+        child2.get(), identity_matrix, anchor, position, bounds, true, false);
+    child2->SetDrawsContent(true);
+    child2->SetForceRenderSurface(true);
+
+    // Remember that grand_child is positioned with respect to its parent (i.e.
+    // child1).  In screen space, the intended position is (10, 50), with size
+    // 100 x 50.
+    position = gfx::PointF(0.f, 40.f);
+    bounds = gfx::Size(100, 50);
+    SetLayerPropertiesForTesting(grand_child1.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+    grand_child1->SetDrawsContent(true);
+    grand_child1->SetForceRenderSurface(true);
+
+    child1->AddChild(grand_child1.Pass());
+    root->AddChild(child1.Pass());
+    root->AddChild(child2.Pass());
+  }
+
+  LayerImpl* child1 = root->children()[0];
+  LayerImpl* child2 = root->children()[1];
+  LayerImpl* grand_child1 = child1->children()[0];
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_TRUE(child1);
+  ASSERT_TRUE(child2);
+  ASSERT_TRUE(grand_child1);
+  ASSERT_TRUE(child1->render_surface());
+  ASSERT_TRUE(child2->render_surface());
+  ASSERT_TRUE(grand_child1->render_surface());
+  ASSERT_EQ(4u, RenderSurfaceLayerList().size());
+  // The root surface has the root layer, and child1's and child2's render
+  // surfaces.
+  ASSERT_EQ(3u, root_layer()->render_surface()->layer_list().size());
+  // The child1 surface has the child1 layer and grand_child1's render surface.
+  ASSERT_EQ(2u, child1->render_surface()->layer_list().size());
+  ASSERT_EQ(1u, child2->render_surface()->layer_list().size());
+  ASSERT_EQ(1u, grand_child1->render_surface()->layer_list().size());
+  ASSERT_EQ(1, RenderSurfaceLayerList().at(0)->id());  // root layer
+  ASSERT_EQ(2, RenderSurfaceLayerList()[1]->id());     // child1
+  ASSERT_EQ(4, RenderSurfaceLayerList().at(2)->id());  // grand_child1
+  ASSERT_EQ(3, RenderSurfaceLayerList()[3]->id());     // child2
+
+  // Nothing overlaps the root_layer at (1, 1), so hit testing there should find
+  // the root layer.
+  gfx::Point test_point = gfx::Point(1, 1);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(1, result_layer->id());
+
+  // At (15, 15), child1 and root are the only layers. child1 is expected to be
+  // on top.
+  test_point = gfx::Point(15, 15);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(2, result_layer->id());
+
+  // At (51, 20), child1 and child2 overlap. child2 is expected to be on top.
+  test_point = gfx::Point(51, 20);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(3, result_layer->id());
+
+  // At (80, 51), child2 and grand_child1 overlap. child2 is expected to be on
+  // top.
+  test_point = gfx::Point(80, 51);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(3, result_layer->id());
+
+  // At (51, 51), all layers overlap each other. child2 is expected to be on top
+  // of all other layers.
+  test_point = gfx::Point(51, 51);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(3, result_layer->id());
+
+  // At (20, 51), child1 and grand_child1 overlap. grand_child1 is expected to
+  // be on top.
+  test_point = gfx::Point(20, 51);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(4, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitTestingForEmptyLayers) {
+  // Layer 1 - root
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 1);
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(
+      root.get(), identity_matrix, anchor, position, bounds, true, false);
+  root->SetDrawsContent(true);
+
+  {
+    // Layer 2 - empty: drawsContent=false
+    gfx::PointF position(10.f, 10.f);
+    gfx::Size bounds(30, 30);
+    scoped_ptr<LayerImpl> empty_layer =
+        LayerImpl::Create(host_impl().active_tree(), 2);
+    SetLayerPropertiesForTesting(empty_layer.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+
+    empty_layer->SetDrawsContent(false);
+    root->AddChild(empty_layer.Pass());
+  }
+
+  {
+    // Layer 3 - empty, but has touch handler
+    gfx::PointF position(10.f, 60.f);
+    gfx::Size bounds(30, 30);
+    scoped_ptr<LayerImpl> test_layer =
+        LayerImpl::Create(host_impl().active_tree(), 3);
+    SetLayerPropertiesForTesting(test_layer.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+
+    test_layer->SetDrawsContent(false);
+    Region touch_handler_region(gfx::Rect(10, 10, 10, 10));
+    test_layer->SetTouchEventHandlerRegion(touch_handler_region);
+    root->AddChild(test_layer.Pass());
+  }
+
+  {
+    // Layer 4 - empty, but has mousewheel handler
+    gfx::PointF position(60.f, 60.f);
+    gfx::Size bounds(30, 30);
+    scoped_ptr<LayerImpl> test_layer =
+        LayerImpl::Create(host_impl().active_tree(), 4);
+    SetLayerPropertiesForTesting(test_layer.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+
+    test_layer->SetDrawsContent(false);
+    test_layer->SetHaveWheelEventHandlers(true);
+    root->AddChild(test_layer.Pass());
+  }
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Verify that the root layer and empty layers with touch/wheel handlers
+  // (but not the empty layer without a touch handler) are in the RSSL.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  EXPECT_EQ(1, RenderSurfaceLayerList()[0]->id());
+  ASSERT_EQ(3u, root_layer()->render_surface()->layer_list().size());
+  EXPECT_EQ(1, root_layer()->render_surface()->layer_list().at(0)->id());
+  EXPECT_EQ(3, root_layer()->render_surface()->layer_list().at(1)->id());
+  EXPECT_EQ(4, root_layer()->render_surface()->layer_list().at(2)->id());
+
+  // Hit testing for a point inside the empty no-handlers layer should return
+  // the root layer.
+  gfx::Point test_point = gfx::Point(15, 15);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(1, result_layer->id());
+
+  // Hit testing for a point inside the touch handler layer should return it.
+  test_point = gfx::Point(15, 75);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(3, result_layer->id());
+
+  // Hit testing for a point inside the mousewheel layer should return it.
+  test_point = gfx::Point(75, 75);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(4, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitCheckingTouchHandlerRegionsForSingleLayer) {
+  scoped_ptr<LayerImpl> root =
+      LayerImpl::Create(host_impl().active_tree(), 12345);
+
+  gfx::Transform identity_matrix;
+  Region touch_handler_region(gfx::Rect(10, 10, 50, 50));
+  gfx::PointF anchor;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(
+      root.get(), identity_matrix, anchor, position, bounds, true, false);
+  root->SetDrawsContent(true);
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+
+  // Hit checking for any point should return a null pointer for a layer without
+  // any touch event handler regions.
+  gfx::Point test_point(11, 11);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  host_impl().active_tree()->root_layer()->SetTouchEventHandlerRegion(
+      touch_handler_region);
+  // Hit checking for a point outside the layer should return a null pointer.
+  test_point = gfx::Point(101, 101);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(-1, -1);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit checking for a point inside the layer, but outside the touch handler
+  // region should return a null pointer.
+  test_point = gfx::Point(1, 1);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(99, 99);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit checking for a point inside the touch event handler region should
+  // return the root layer.
+  test_point = gfx::Point(11, 11);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+
+  test_point = gfx::Point(59, 59);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest,
+       HitCheckingTouchHandlerRegionsForUninvertibleTransform) {
+  scoped_ptr<LayerImpl> root =
+      LayerImpl::Create(host_impl().active_tree(), 12345);
+
+  gfx::Transform uninvertible_transform;
+  uninvertible_transform.matrix().set(0, 0, 0.0);
+  uninvertible_transform.matrix().set(1, 1, 0.0);
+  uninvertible_transform.matrix().set(2, 2, 0.0);
+  uninvertible_transform.matrix().set(3, 3, 0.0);
+  ASSERT_FALSE(uninvertible_transform.IsInvertible());
+
+  gfx::Transform identity_matrix;
+  Region touch_handler_region(gfx::Rect(10, 10, 50, 50));
+  gfx::PointF anchor;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(root.get(),
+                               uninvertible_transform,
+                               anchor,
+                               position,
+                               bounds,
+                               true,
+                               false);
+  root->SetDrawsContent(true);
+  root->SetTouchEventHandlerRegion(touch_handler_region);
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+  ASSERT_FALSE(root_layer()->screen_space_transform().IsInvertible());
+
+  // Hit checking any point should not hit the touch handler region on the
+  // layer. If the invertible matrix is accidentally ignored and treated like an
+  // identity, then the hit testing will incorrectly hit the layer when it
+  // shouldn't.
+  gfx::Point test_point(1, 1);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(10, 10);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(10, 30);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(50, 50);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(67, 48);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(99, 99);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(-1, -1);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+}
+
+TEST_F(LayerTreeImplTest,
+       HitCheckingTouchHandlerRegionsForSinglePositionedLayer) {
+  scoped_ptr<LayerImpl> root =
+      LayerImpl::Create(host_impl().active_tree(), 12345);
+
+  gfx::Transform identity_matrix;
+  Region touch_handler_region(gfx::Rect(10, 10, 50, 50));
+  gfx::PointF anchor;
+  // this layer is positioned, and hit testing should correctly know where the
+  // layer is located.
+  gfx::PointF position(50.f, 50.f);
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(
+      root.get(), identity_matrix, anchor, position, bounds, true, false);
+  root->SetDrawsContent(true);
+  root->SetTouchEventHandlerRegion(touch_handler_region);
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+
+  // Hit checking for a point outside the layer should return a null pointer.
+  gfx::Point test_point(49, 49);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Even though the layer has a touch handler region containing (101, 101), it
+  // should not be visible there since the root render surface would clamp it.
+  test_point = gfx::Point(101, 101);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit checking for a point inside the layer, but outside the touch handler
+  // region should return a null pointer.
+  test_point = gfx::Point(51, 51);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit checking for a point inside the touch event handler region should
+  // return the root layer.
+  test_point = gfx::Point(61, 61);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+
+  test_point = gfx::Point(99, 99);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest,
+       HitCheckingTouchHandlerRegionsForSingleLayerWithScaledContents) {
+  // A layer's visible content rect is actually in the layer's content space.
+  // The screen space transform converts from the layer's origin space to screen
+  // space. This test makes sure that hit testing works correctly accounts for
+  // the contents scale.  A contents scale that is not 1 effectively forces a
+  // non-identity transform between layer's content space and layer's origin
+  // space. The hit testing code must take this into account.
+  //
+  // To test this, the layer is positioned at (25, 25), and is size (50, 50). If
+  // contents scale is ignored, then hit checking will mis-interpret the visible
+  // content rect as being larger than the actual bounds of the layer.
+  //
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 1);
+
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+
+  SetLayerPropertiesForTesting(root.get(),
+                               identity_matrix,
+                               anchor,
+                               gfx::PointF(),
+                               gfx::Size(100, 100),
+                               true,
+                               false);
+  {
+    Region touch_handler_region(gfx::Rect(10, 10, 30, 30));
+    gfx::PointF position(25.f, 25.f);
+    gfx::Size bounds(50, 50);
+    scoped_ptr<LayerImpl> test_layer =
+        LayerImpl::Create(host_impl().active_tree(), 12345);
+    SetLayerPropertiesForTesting(test_layer.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+
+    // override content bounds and contents scale
+    test_layer->SetContentBounds(gfx::Size(100, 100));
+    test_layer->SetContentsScale(2, 2);
+
+    test_layer->SetDrawsContent(true);
+    test_layer->SetTouchEventHandlerRegion(touch_handler_region);
+    root->AddChild(test_layer.Pass());
+  }
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  // The visible content rect for test_layer is actually 100x100, even though
+  // its layout size is 50x50, positioned at 25x25.
+  LayerImpl* test_layer =
+      host_impl().active_tree()->root_layer()->children()[0];
+  EXPECT_RECT_EQ(gfx::Rect(0, 0, 100, 100), test_layer->visible_content_rect());
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+
+  // Hit checking for a point outside the layer should return a null pointer
+  // (the root layer does not draw content, so it will not be tested either).
+  gfx::Point test_point(76, 76);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit checking for a point inside the layer, but outside the touch handler
+  // region should return a null pointer.
+  test_point = gfx::Point(26, 26);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(34, 34);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(65, 65);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(74, 74);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit checking for a point inside the touch event handler region should
+  // return the root layer.
+  test_point = gfx::Point(35, 35);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+
+  test_point = gfx::Point(64, 64);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest,
+       HitCheckingTouchHandlerRegionsForSingleLayerWithDeviceScale) {
+  // The layer's device_scale_factor and page_scale_factor should scale the
+  // content rect and we should be able to hit the touch handler region by
+  // scaling the points accordingly.
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 1);
+
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+  // Set the bounds of the root layer big enough to fit the child when scaled.
+  SetLayerPropertiesForTesting(root.get(),
+                               identity_matrix,
+                               anchor,
+                               gfx::PointF(),
+                               gfx::Size(100, 100),
+                               true,
+                               false);
+  {
+    Region touch_handler_region(gfx::Rect(10, 10, 30, 30));
+    gfx::PointF position(25.f, 25.f);
+    gfx::Size bounds(50, 50);
+    scoped_ptr<LayerImpl> test_layer =
+        LayerImpl::Create(host_impl().active_tree(), 12345);
+    SetLayerPropertiesForTesting(test_layer.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+
+    test_layer->SetDrawsContent(true);
+    test_layer->SetTouchEventHandlerRegion(touch_handler_region);
+    root->AddChild(test_layer.Pass());
+  }
+
+  float device_scale_factor = 3.f;
+  float page_scale_factor = 5.f;
+  gfx::Size scaled_bounds_for_root = gfx::ToCeiledSize(
+      gfx::ScaleSize(root->bounds(), device_scale_factor * page_scale_factor));
+  host_impl().SetViewportSize(scaled_bounds_for_root);
+
+  host_impl().SetDeviceScaleFactor(device_scale_factor);
+  host_impl().active_tree()->SetPageScaleFactorAndLimits(
+      page_scale_factor, page_scale_factor, page_scale_factor);
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->SetViewportLayersFromIds(1, 1, Layer::INVALID_ID);
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  // The visible content rect for test_layer is actually 100x100, even though
+  // its layout size is 50x50, positioned at 25x25.
+  LayerImpl* test_layer =
+      host_impl().active_tree()->root_layer()->children()[0];
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+
+  // Check whether the child layer fits into the root after scaled.
+  EXPECT_RECT_EQ(gfx::Rect(test_layer->content_bounds()),
+                 test_layer->visible_content_rect());
+
+  // Hit checking for a point outside the layer should return a null pointer
+  // (the root layer does not draw content, so it will not be tested either).
+  gfx::PointF test_point(76.f, 76.f);
+  test_point =
+      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit checking for a point inside the layer, but outside the touch handler
+  // region should return a null pointer.
+  test_point = gfx::Point(26, 26);
+  test_point =
+      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(34, 34);
+  test_point =
+      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(65, 65);
+  test_point =
+      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(74, 74);
+  test_point =
+      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit checking for a point inside the touch event handler region should
+  // return the root layer.
+  test_point = gfx::Point(35, 35);
+  test_point =
+      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+
+  test_point = gfx::Point(64, 64);
+  test_point =
+      gfx::ScalePoint(test_point, device_scale_factor * page_scale_factor);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(12345, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitCheckingTouchHandlerRegionsForSimpleClippedLayer) {
+  // Test that hit-checking will only work for the visible portion of a layer,
+  // and not the entire layer bounds. Here we just test the simple axis-aligned
+  // case.
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 1);
+  SetLayerPropertiesForTesting(root.get(),
+                               identity_matrix,
+                               anchor,
+                               gfx::PointF(),
+                               gfx::Size(100, 100),
+                               true,
+                               false);
+  {
+    scoped_ptr<LayerImpl> clipping_layer =
+        LayerImpl::Create(host_impl().active_tree(), 123);
+    // this layer is positioned, and hit testing should correctly know where the
+    // layer is located.
+    gfx::PointF position(25.f, 25.f);
+    gfx::Size bounds(50, 50);
+    SetLayerPropertiesForTesting(clipping_layer.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+    clipping_layer->SetMasksToBounds(true);
+
+    scoped_ptr<LayerImpl> child =
+        LayerImpl::Create(host_impl().active_tree(), 456);
+    Region touch_handler_region(gfx::Rect(10, 10, 50, 50));
+    position = gfx::PointF(-50.f, -50.f);
+    bounds = gfx::Size(300, 300);
+    SetLayerPropertiesForTesting(
+        child.get(), identity_matrix, anchor, position, bounds, true, false);
+    child->SetDrawsContent(true);
+    child->SetTouchEventHandlerRegion(touch_handler_region);
+    clipping_layer->AddChild(child.Pass());
+    root->AddChild(clipping_layer.Pass());
+  }
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
+  ASSERT_EQ(456, root_layer()->render_surface()->layer_list().at(0)->id());
+
+  // Hit checking for a point outside the layer should return a null pointer.
+  // Despite the child layer being very large, it should be clipped to the root
+  // layer's bounds.
+  gfx::Point test_point(24, 24);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit checking for a point inside the layer, but outside the touch handler
+  // region should return a null pointer.
+  test_point = gfx::Point(35, 35);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  test_point = gfx::Point(74, 74);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+
+  // Hit checking for a point inside the touch event handler region should
+  // return the root layer.
+  test_point = gfx::Point(25, 25);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(456, result_layer->id());
+
+  test_point = gfx::Point(34, 34);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(456, result_layer->id());
+}
+
+TEST_F(LayerTreeImplTest, HitCheckingTouchHandlerOverlappingRegions) {
+  gfx::Transform identity_matrix;
+  gfx::PointF anchor;
+
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 1);
+  SetLayerPropertiesForTesting(root.get(),
+                               identity_matrix,
+                               anchor,
+                               gfx::PointF(),
+                               gfx::Size(100, 100),
+                               true,
+                               false);
+  {
+    scoped_ptr<LayerImpl> touch_layer =
+        LayerImpl::Create(host_impl().active_tree(), 123);
+    // this layer is positioned, and hit testing should correctly know where the
+    // layer is located.
+    gfx::PointF position;
+    gfx::Size bounds(50, 50);
+    SetLayerPropertiesForTesting(touch_layer.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+    touch_layer->SetDrawsContent(true);
+    touch_layer->SetTouchEventHandlerRegion(gfx::Rect(0, 0, 50, 50));
+    root->AddChild(touch_layer.Pass());
+  }
+
+  {
+    scoped_ptr<LayerImpl> notouch_layer =
+        LayerImpl::Create(host_impl().active_tree(), 1234);
+    // this layer is positioned, and hit testing should correctly know where the
+    // layer is located.
+    gfx::PointF position(0, 25);
+    gfx::Size bounds(50, 50);
+    SetLayerPropertiesForTesting(notouch_layer.get(),
+                                 identity_matrix,
+                                 anchor,
+                                 position,
+                                 bounds,
+                                 true,
+                                 false);
+    notouch_layer->SetDrawsContent(true);
+    root->AddChild(notouch_layer.Pass());
+  }
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(root.Pass());
+  host_impl().active_tree()->UpdateDrawProperties();
+
+  // Sanity check the scenario we just created.
+  ASSERT_EQ(1u, RenderSurfaceLayerList().size());
+  ASSERT_EQ(2u, root_layer()->render_surface()->layer_list().size());
+  ASSERT_EQ(123, root_layer()->render_surface()->layer_list().at(0)->id());
+  ASSERT_EQ(1234, root_layer()->render_surface()->layer_list().at(1)->id());
+
+  gfx::Point test_point(35, 35);
+  LayerImpl* result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+
+  // We should have passed through the no-touch layer and found the layer
+  // behind it.
+  EXPECT_TRUE(result_layer);
+
+  host_impl().active_tree()->LayerById(1234)->SetContentsOpaque(true);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+
+  // Even with an opaque layer in the middle, we should still find the layer
+  // with
+  // the touch handler behind it (since we can't assume that opaque layers are
+  // opaque to hit testing).
+  EXPECT_TRUE(result_layer);
+
+  test_point = gfx::Point(35, 15);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  ASSERT_TRUE(result_layer);
+  EXPECT_EQ(123, result_layer->id());
+
+  test_point = gfx::Point(35, 65);
+  result_layer =
+      host_impl().active_tree()->FindLayerThatIsHitByPointInTouchHandlerRegion(
+          test_point);
+  EXPECT_FALSE(result_layer);
+}
+
+}  // namespace
+}  // namespace cc