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

cc/animation/animation_host.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_HOST_H_
 #define CC_ANIMATION_ANIMATION_HOST_H_
 
 #include <memory>
 #include <unordered_map>
 
@@ skipping 62 matching lines @@
       ElementId element_id) const;
 
   // Parent LayerTreeHost or LayerTreeHostImpl.
   MutatorHostClient* mutator_host_client() { return mutator_host_client_; }
   const MutatorHostClient* mutator_host_client() const {
     return mutator_host_client_;
   }
   void SetMutatorHostClient(MutatorHostClient* client);
 
   void SetNeedsCommit();
-  void SetNeedsRebuildPropertyTrees();
+  void SetNeedsPushProperties();
+  bool needs_push_properties() const { return needs_push_properties_; }
 
   void PushPropertiesTo(AnimationHost* host_impl);
 
   void SetSupportsScrollAnimations(bool supports_scroll_animations);
   bool SupportsScrollAnimations() const;
   bool NeedsAnimateLayers() const;
 
   bool ActivateAnimations();
   bool AnimateLayers(base::TimeTicks monotonic_time);
   bool UpdateAnimationState(bool start_ready_animations,
@@ skipping 71 matching lines @@
   void DidDeactivateElementAnimations(ElementAnimations* element_animations);
 
   // Registers the given ElementAnimations as alive.
   void RegisterElementAnimations(ElementAnimations* element_animations);
   // Unregisters the given ElementAnimations as alive.
   void UnregisterElementAnimations(ElementAnimations* element_animations);
 
   const ElementToAnimationsMap& active_element_animations_for_testing() const;
   const ElementToAnimationsMap& all_element_animations_for_testing() const;
 
-  bool animation_waiting_for_deletion() const {
-    return animation_waiting_for_deletion_;
-  }
-  void OnAnimationWaitingForDeletion();
-
  private:
   explicit AnimationHost(ThreadInstance thread_instance);
 
   void PushTimelinesToImplThread(AnimationHost* host_impl) const;
   void RemoveTimelinesFromImplThread(AnimationHost* host_impl) const;
   void PushPropertiesToImplThread(AnimationHost* host_impl);
 
   void EraseTimeline(scoped_refptr<AnimationTimeline> timeline);
 
   ElementToAnimationsMap element_to_animations_map_;
   ElementToAnimationsMap active_element_to_animations_map_;
 
   // A list of all timelines which this host owns.
   using IdToTimelineMap =
       std::unordered_map<int, scoped_refptr<AnimationTimeline>>;
   IdToTimelineMap id_to_timeline_map_;
 
   MutatorHostClient* mutator_host_client_;
 
   std::unique_ptr<ScrollOffsetAnimations> scroll_offset_animations_;
   std::unique_ptr<ScrollOffsetAnimationsImpl> scroll_offset_animations_impl_;
 
   const ThreadInstance thread_instance_;
 
   bool supports_scroll_animations_;
-  bool animation_waiting_for_deletion_;
+  bool needs_push_properties_;
 
   DISALLOW_COPY_AND_ASSIGN(AnimationHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ANIMATION_HOST_H_