Run smooth scroll animations on the compositor when possible

cc/layers/layer.cc

 // Copyright 2010 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/layers/layer.h"
 
 #include <algorithm>
 
 #include "base/atomic_sequence_num.h"
 #include "base/location.h"
@@ skipping 1857 matching lines @@
   SetNeedsCommit();
 }
 
 void Layer::RemoveAnimation(int animation_id,
                             Animation::TargetProperty property) {
   DCHECK(layer_animation_controller_);
   layer_animation_controller_->RemoveAnimation(animation_id, property);
   SetNeedsCommit();
 }
 
+void Layer::AbortAnimation(int animation_id) {
+  DCHECK(layer_animation_controller_);
+  layer_animation_controller_->AbortAnimation(animation_id);
+  SetNeedsCommit();
+}
+
 void Layer::SetLayerAnimationControllerForTest(
     scoped_refptr<LayerAnimationController> controller) {
   DCHECK(layer_animation_controller_);
   layer_animation_controller_->RemoveValueObserver(this);
   layer_animation_controller_ = controller;
   layer_animation_controller_->AddValueObserver(this);
   SetNeedsCommit();
 }
 
 bool Layer::HasActiveAnimation() const {
@@ skipping 148 matching lines @@
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 gfx::Transform Layer::screen_space_transform() const {
   DCHECK_NE(transform_tree_index_, -1);
   return ScreenSpaceTransformFromPropertyTrees(
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 }  // namespace cc