Splitting of layers for correct intersections

Sorting 3d-sorted layers and rendering them in that order causes issues
when layers intersect. Instead place 3d-sorted layers in a bsp tree and
fragment any intersecting layers into non-rectangular quads. We can then
render the fragments in the correct sorted order regardless of
intersections.

BUG=455918,159225,132122,230833

Review URL: https://codereview.chromium.org/595593002

Cr-Commit-Position: refs/heads/master@{#320276}

1 files changed, 0 insertions, 8 deletions

diff --git a/cc/trees/layer_tree_impl_unittest.cc b/cc/trees/layer_tree_impl_unittest.cc
index 67f98e65..06df3c2 100644
--- a/cc/trees/layer_tree_impl_unittest.cc
+++ b/cc/trees/layer_tree_impl_unittest.cc
@@ -920,14 +920,6 @@ TEST_F(LayerTreeImplTest, HitTestingForMultipleLayersAtVaryingDepths) {
   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);