cc : Add LayerToPropertyTreeIndices map to PropertyTrees

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index bf4ccf59c2880bcc76e0b38a0dd95d3f89eda686..b456d54712be62bfac789091fa1e5b51cd0a8563 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -168,11 +168,23 @@ class CC_EXPORT LayerTreeImpl {
     LayerImpl* scroll = nullptr;
   };
 
+  struct CC_EXPORT PropertyTreeIndices {
+    int transform_tree_index = -1;
+    int effect_tree_index = -1;
+    int clip_tree_index = -1;
+    int scroll_tree_index = -1;
+  };
+
   void AddToElementMap(LayerImpl* layer);
   void RemoveFromElementMap(LayerImpl* layer);
 
   void AddToOpacityAnimationsMap(int id, float opacity);
 
+  void UpdateLayerToPropertyTreeIndicesMap(int id,
+                                           int tree_index,
+                                           PropertyTrees::Types tree_type);
+  void RemoveFromLayerToPropertyTreeIndicesMap(int id);
+
   ElementLayers GetMutableLayers(uint64_t element_id);
   int source_frame_number() const { return source_frame_number_; }
   void set_source_frame_number(int frame_number) {
@@ -486,7 +498,7 @@ class CC_EXPORT LayerTreeImpl {
         event_properties;
   }
 
-  void ResetAllChangeTracking(PropertyTrees::ResetFlags flag);
+  void ResetAllChangeTracking(PropertyTrees::Types type);
 
  protected:
   explicit LayerTreeImpl(
@@ -539,6 +551,9 @@ class CC_EXPORT LayerTreeImpl {
 
   std::unordered_map<int, float> opacity_animations_map_;
 
+  std::unordered_map<int, PropertyTreeIndices>
+      layer_to_property_tree_indices_map_;
+
   // Maps from clip layer ids to scroll layer ids.  Note that this only includes
   // the subset of clip layers that act as scrolling containers.  (This is
   // derived from LayerImpl::scroll_clip_layer_ and exists to avoid O(n) walks.)