CC Animation: Introduce some dirty flags to optimize PushProperties on commit

cc/animation/animation_player.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_ANIMATION_PLAYER_H_
 #define CC_ANIMATION_ANIMATION_PLAYER_H_
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 64 matching lines @@
   // AnimationDelegate routing.
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
                               TargetProperty::Type target_property,
                               int group);
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
                                TargetProperty::Type target_property,
                                int group);
   void NotifyAnimationAborted(base::TimeTicks monotonic_time,
                               TargetProperty::Type target_property,
                               int group);
+  void NotifyAnimationWaitingForDeletion();
   void NotifyAnimationTakeover(base::TimeTicks monotonic_time,
                                TargetProperty::Type target_property,
                                double animation_start_time,
                                std::unique_ptr<AnimationCurve> curve);
 
   // Whether this player has animations waiting to get sent to ElementAnimations
   bool has_pending_animations_for_testing() const {
     return !animations_.empty();
   }
 
+  bool needs_push_properties() const { return needs_push_properties_; }
+  void SetNeedsPushProperties();
+
  private:
   friend class base::RefCounted<AnimationPlayer>;
 
   explicit AnimationPlayer(int id);
   ~AnimationPlayer();
 
   void SetNeedsCommit();
 
   void RegisterPlayer();
   void UnregisterPlayer();
 
   void BindElementAnimations();
   void UnbindElementAnimations();
 
   // We accumulate added animations in animations_ container
   // if element_animations_ is a nullptr. It allows us to add/remove animations
   // to non-attached AnimationPlayers.
   std::vector<std::unique_ptr<Animation>> animations_;
 
   AnimationHost* animation_host_;
   AnimationTimeline* animation_timeline_;
   // element_animations isn't null if player attached to an element (layer).
   scoped_refptr<ElementAnimations> element_animations_;
   AnimationDelegate* animation_delegate_;
 
   int id_;
   ElementId element_id_;
+  bool needs_push_properties_;
 
   DISALLOW_COPY_AND_ASSIGN(AnimationPlayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ANIMATION_PLAYER_H_