cc: Main thread skip single layers instead of subtrees

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index 37055539d0a93744d8aaceef1416db37ad054ea4..40d7336c64b4346a611452ab79f589b082ffe1d0 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -98,6 +98,7 @@ class CC_EXPORT LayerImpl {
   void OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset);
   void OnTransformIsPotentiallyAnimatingChanged(bool is_animating);
   bool IsActive() const;
+  bool OpacityCanAnimateOnImplThread() const { return false; }

[ajuma, 2016/04/06 19:49:28]

Hmm. This sounds confusing (since opacity can indeed animated on the impl thread
for some layers), and I think it can be removed (see comment in
property_tree_builder.cc).

[sunxd, 2016/04/07 15:37:12]

Done.

 
   // Tree structure.
   LayerImpl* parent() { return parent_; }