cc : Track opacity animation changes on effect tree

cc/animation/element_animations.h

 // Copyright 2015 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_ANIMATION_ELEMENT_ANIMATIONS_H_
 #define CC_ANIMATION_ELEMENT_ANIMATIONS_H_
 
 #include <bitset>
 #include <memory>
 #include <vector>
@@ skipping 211 matching lines @@
                                         bool notify_pending_elements);
 
   void NotifyClientAnimationWaitingForDeletion();
 
   void NotifyClientTransformIsPotentiallyAnimatingChanged(
       bool notify_active_elements,
       bool notify_pending_elements);
 
   void UpdatePotentiallyAnimatingTransform();
 
+  bool AllOpacityAnimationsEnded();
+
   void OnFilterAnimated(ElementListType list_type,
                         const FilterOperations& filters);
   void OnOpacityAnimated(ElementListType list_type, float opacity);
   void OnTransformAnimated(ElementListType list_type,
                            const gfx::Transform& transform);
   void OnScrollOffsetAnimated(ElementListType list_type,
                               const gfx::ScrollOffset& scroll_offset);
   void OnAnimationWaitingForDeletion();
   void OnTransformIsPotentiallyAnimatingChanged(ElementListType list_type,
                                                 bool is_animating);
+  void OnOpacityIsCurrentlyAnimatingChanged(bool is_currently_animating);
   gfx::ScrollOffset ScrollOffsetForAnimation() const;
 
   void NotifyPlayersAnimationStarted(base::TimeTicks monotonic_time,
                                      TargetProperty::Type target_property,
                                      int group);
   void NotifyPlayersAnimationFinished(base::TimeTicks monotonic_time,
                                       TargetProperty::Type target_property,
                                       int group);
   void NotifyPlayersAnimationAborted(base::TimeTicks monotonic_time,
                                      TargetProperty::Type target_property,
@@ skipping 25 matching lines @@
 
   bool potentially_animating_transform_for_active_elements_;
   bool potentially_animating_transform_for_pending_elements_;
 
   DISALLOW_COPY_AND_ASSIGN(ElementAnimations);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ELEMENT_ANIMATIONS_H_