cc :: Move some tracking of layer_property_changed to main thread.

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index 7c0697d25cb7ad36e01f225902cab4787f8b515c..2aa81dfaf919d76232155829b481c37344025915 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -540,6 +540,9 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
     return has_render_surface_;
   }
 
+  void SetSubtreePropertyChanged();
+  bool subtree_property_changed() const { return subtree_property_changed_; }
+
   // Sets new frame timing requests for this layer.
   void SetFrameTimingRequests(const std::vector<FrameTimingRequest>& requests);
 
@@ -743,6 +746,7 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   bool force_render_surface_ : 1;
   bool transform_is_invertible_ : 1;
   bool has_render_surface_ : 1;
+  bool subtree_property_changed_ : 1;
   Region non_fast_scrollable_region_;
   Region touch_event_handler_region_;
   gfx::PointF position_;