Run smooth scroll animations on the compositor when possible

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/containers/linked_list.h"
@@ skipping 49 matching lines @@
   void set_layer_animation_delegate(AnimationDelegate* delegate) {
     layer_animation_delegate_ = delegate;
   }
 
   void AttachLayer(int layer_id);
   void DetachLayer();
 
   void AddAnimation(scoped_ptr<Animation> animation);
   void PauseAnimation(int animation_id, double time_offset);
   void RemoveAnimation(int animation_id);
+  void AbortAnimation(int animation_id);
 
   void PushPropertiesTo(AnimationPlayer* player_impl);
 
   // AnimationDelegate routing.
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
                               Animation::TargetProperty target_property,
                               int group);
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
                                Animation::TargetProperty target_property,
                                int group);
@@ skipping 25 matching lines @@
 
   int id_;
   int layer_id_;
 
   DISALLOW_COPY_AND_ASSIGN(AnimationPlayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ANIMATION_PLAYER_H_