cc : Track opacity animation changes on effect tree

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 <unordered_map>
@@ skipping 253 matching lines @@
   float screen_space_opacity;
 
   bool has_render_surface;
   RenderSurfaceImpl* render_surface;
   bool has_copy_request;
   bool has_background_filters;
   bool hidden_by_backface_visibility;
   bool double_sided;
   bool is_drawn;
   bool has_animated_opacity;
+  bool is_currently_animating_opacity;
   // We need to track changes to effects on the compositor to compute damage
   // rect.
   bool effect_changed;
   int num_copy_requests_in_subtree;
   int transform_id;
   int clip_id;
   // Effect node id of which this effect contributes to.
   int target_id;
 
   bool operator==(const EffectNodeData& other) const;
@@ skipping 402 matching lines @@
 
  private:
   gfx::Vector2dF inner_viewport_container_bounds_delta_;
   gfx::Vector2dF outer_viewport_container_bounds_delta_;
   gfx::Vector2dF inner_viewport_scroll_bounds_delta_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_TREE_H_