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 84e9c0f8ba69c65fa70ce676ed5cc1f6e61e0ae7..756217ddbd55cd0fe0a85df2304369f27f345996 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -696,6 +696,10 @@ 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);