cc : Track opacity animation changes on effect tree

cc/trees/layer_tree_host.h

 // Copyright 2011 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_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 361 matching lines @@
                                   ElementListType list_type,
                                   const gfx::Transform& transform) override;
   void SetElementScrollOffsetMutated(
       ElementId element_id,
       ElementListType list_type,
       const gfx::ScrollOffset& scroll_offset) override;
   void ElementTransformIsPotentiallyAnimatingChanged(
       ElementId element_id,
       ElementListType list_type,
       bool is_animating) override;
+  void ElementOpacityIsAnimatingChanged(ElementId element_id,
+                                        ElementListType list_type,
+                                        AnimationChangeType change_type,
+                                        bool is_animating) override;
   void ScrollOffsetAnimationFinished() override {}
   gfx::ScrollOffset GetScrollOffsetForAnimation(
       ElementId element_id) const override;
 
   bool ScrollOffsetAnimationWasInterrupted(const Layer* layer) const;
   bool IsAnimatingFilterProperty(const Layer* layer) const;
   bool IsAnimatingOpacityProperty(const Layer* layer) const;
   bool IsAnimatingTransformProperty(const Layer* layer) const;
   bool HasPotentiallyRunningFilterAnimation(const Layer* layer) const;
   bool HasPotentiallyRunningOpacityAnimation(const Layer* layer) const;
@@ skipping 194 matching lines @@
 
   uint32_t surface_id_namespace_;
   uint32_t next_surface_sequence_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_