cc: Stop pushing properties every activation for picture layers.

cc/resources/picture_layer_tiling.h

Index: cc/resources/picture_layer_tiling.h
diff --git a/cc/resources/picture_layer_tiling.h b/cc/resources/picture_layer_tiling.h
index 15fdb4320eea2c640107054bfef7298e423ce0fa..4717573cbfa3c9da7e163c91f06fd63ab340cc31 100644
--- a/cc/resources/picture_layer_tiling.h
+++ b/cc/resources/picture_layer_tiling.h
@@ -50,6 +50,10 @@ class CC_EXPORT PictureLayerTilingClient {
   virtual WhichTree GetTree() const = 0;
   virtual bool RequiresHighResToDraw() const = 0;
 
+  // Callback to notify the client that the live rect (set of tiles) changed for
+  // a tiling.
+  virtual void TilingLiveRectChanged() = 0;
+
  protected:
   virtual ~PictureLayerTilingClient() {}
 };