cc: Make DamageTracker use the effect tree and layer list

cc/trees/property_tree.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TREES_PROPERTY_TREE_H_
 #define CC_TREES_PROPERTY_TREE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 362 matching lines @@
   void AddCopyRequest(int node_id, std::unique_ptr<CopyOutputRequest> request);
   void PushCopyRequestsTo(EffectTree* other_tree);
   void TakeCopyRequestsAndTransformToSurface(
       int node_id,
       std::vector<std::unique_ptr<CopyOutputRequest>>* requests);
   bool HasCopyRequests() const;
   void ClearCopyRequests();
 
   int ClosestAncestorWithCopyRequest(int id) const;
 
+  // Given the ids of two effect nodes that have render surfaces, returns the
+  // id of the lowest common ancestor effect node that also has a render
+  // surface.
+  int LowestCommonAncestorWithRenderSurface(int id_1, int id_2) const;
+
   void AddMaskLayerId(int id);
   const std::vector<int>& mask_layer_ids() const { return mask_layer_ids_; }
 
   RenderSurfaceImpl* GetRenderSurface(int id) {
     return render_surfaces_[id].get();
   }
 
   const RenderSurfaceImpl* GetRenderSurface(int id) const {
     return render_surfaces_[id].get();
   }
@@ skipping 331 matching lines @@
   DrawTransforms& GetDrawTransforms(int transform_id, int effect_id) const;
   DrawTransformData& FetchDrawTransformsDataFromCache(int transform_id,
                                                       int effect_id) const;
 
   PropertyTreesCachedData cached_data_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_TREE_H_