cc: Use Element Id to Record Animation Changes

cc/trees/property_tree.h

Index: cc/trees/property_tree.h
diff --git a/cc/trees/property_tree.h b/cc/trees/property_tree.h
index 3dc0594bf158e558b5b37a49e9abadc9655dd58c..46f0cb7c57e68e9902183589a0bf55b20a912293 100644
--- a/cc/trees/property_tree.h
+++ b/cc/trees/property_tree.h
@@ -104,7 +104,8 @@ class CC_EXPORT PropertyTree {
   }
   T* UpdateNodeFromOwningLayerId(int id) {
     int index = FindNodeIndexFromOwningLayerId(id);
-    if (index == kInvalidNodeId && property_trees()->is_main_thread) {
+    if (index == kInvalidNodeId) {
+      DCHECK(property_trees()->is_main_thread);
       property_trees()->needs_rebuild = true;
     }
 
@@ -171,6 +172,7 @@ class CC_EXPORT TransformTree final : public PropertyTree<TransformNode> {
 
   void clear();
 
+  TransformNode* FindNodeFromElementId(ElementId id);
   void OnTransformAnimated(const gfx::Transform& transform,
                            int id,
                            LayerTreeImpl* layer_tree_impl);
@@ -340,6 +342,7 @@ class CC_EXPORT EffectTree final : public PropertyTree<EffectNode> {
 
   void UpdateSurfaceContentsScale(EffectNode* node);
 
+  EffectNode* FindNodeFromElementId(ElementId id);
   void OnOpacityAnimated(float opacity, int id, LayerTreeImpl* layer_tree_impl);
   void OnFilterAnimated(const FilterOperations& filters,
                         int id,