cc: Make property trees support elastic overscroll

This makes property trees aware of the elastic overscroll
value, which is used for the overscroll rubberbanding
effect on Mac.

BUG=559550
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1494723002

Cr-Commit-Position: refs/heads/master@{#363302}

1 files changed, 16 insertions, 0 deletions

diff --git a/cc/trees/draw_property_utils.h b/cc/trees/draw_property_utils.h
index 5c99458..72d9337 100644
--- a/cc/trees/draw_property_utils.h
+++ b/cc/trees/draw_property_utils.h
@@ -11,6 +11,7 @@
 namespace gfx {
 class Rect;
 class Transform;
+class Vector2dF;
 }  // namespace gfx
 
 namespace cc {
@@ -46,6 +47,8 @@ void CC_EXPORT BuildPropertyTreesAndComputeVisibleRects(
     const Layer* page_scale_layer,
     const Layer* inner_viewport_scroll_layer,
     const Layer* outer_viewport_scroll_layer,
+    const Layer* overscroll_elasticity_layer,
+    const gfx::Vector2dF& elastic_overscroll,
     float page_scale_factor,
     float device_scale_factor,
     const gfx::Rect& viewport,
@@ -59,6 +62,8 @@ void CC_EXPORT BuildPropertyTreesAndComputeVisibleRects(
     const LayerImpl* page_scale_layer,
     const LayerImpl* inner_viewport_scroll_layer,
     const LayerImpl* outer_viewport_scroll_layer,
+    const LayerImpl* overscroll_elasticity_layer,
+    const gfx::Vector2dF& elastic_overscroll,
     float page_scale_factor,
     float device_scale_factor,
     const gfx::Rect& viewport,
@@ -123,6 +128,17 @@ UpdatePageScaleFactorInPropertyTrees(PropertyTrees* property_trees,
                                      float page_scale_factor,
                                      float device_scale_factor,
                                      const gfx::Transform device_transform);
+
+void CC_EXPORT UpdateElasticOverscrollInPropertyTrees(
+    PropertyTrees* property_trees,
+    const LayerImpl* overscroll_elasticity_layer,
+    const gfx::Vector2dF& elastic_overscroll);
+
+void CC_EXPORT UpdateElasticOverscrollInPropertyTrees(
+    PropertyTrees* property_trees,
+    const Layer* overscroll_elasticity_layer,
+    const gfx::Vector2dF& elastic_overscroll);
+
 }  // namespace cc
 
 #endif  // CC_TREES_DRAW_PROPERTY_UTILS_H_