Rebuild PropertyTrees When Layer Attach to New LayerTreeHost

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index 9c7138e9fdc515040f908c1543a5fa11815813ec..2e4f172292fe456a17d2ab9b6fa2fb6b8145af97 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -674,6 +674,10 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   // children.
   void RemoveFromClipTree();
 
+  // When we detach or attach layer to new LayerTreeHost, all property trees'
+  // indices becomes invalid.
+  void InvalidatePropertyTreesIndices();
+
   void UpdateNumCopyRequestsForSubtree(bool add);
   void UpdateNumInputHandlersForSubtree(bool add);