Run smooth scroll animations on the compositor when possible

cc/animation/animation_player.cc

 // 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.
 
 #include "cc/animation/animation_player.h"
 
 #include "cc/animation/animation_delegate.h"
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_timeline.h"
 #include "cc/animation/element_animations.h"
@@ skipping 135 matching lines @@
   } else {
     auto animations_to_remove =
         std::remove_if(animations_.begin(), animations_.end(),
                        [animation_id](const scoped_ptr<Animation>& animation) {
                          return animation->id() == animation_id;
                        });
     animations_.erase(animations_to_remove, animations_.end());
   }
 }
 
+void AnimationPlayer::AbortAnimation(int animation_id) {
+  DCHECK(element_animations_);
+  element_animations_->layer_animation_controller()->AbortAnimation(
+      animation_id);
+  SetNeedsCommit();
+}
+
 void AnimationPlayer::PushPropertiesTo(AnimationPlayer* player_impl) {
   if (!element_animations_) {
     if (player_impl->element_animations())
       player_impl->DetachLayer();
     return;
   }
 
   DCHECK(layer_id_);
   if (!player_impl->element_animations())
     player_impl->AttachLayer(layer_id_);
@@ skipping 17 matching lines @@
                                                        target_property, group);
 }
 
 void AnimationPlayer::SetNeedsCommit() {
   DCHECK(animation_host_);
   animation_host_->SetNeedsCommit();
   animation_host_->SetNeedsRebuildPropertyTrees();
 }
 
 }  // namespace cc