Run smooth scroll animations on the compositor when possible

cc/blink/web_layer_impl.cc

 // Copyright 2014 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/blink/web_layer_impl.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 252 matching lines @@
     int animation_id,
     blink::WebCompositorAnimation::TargetProperty target_property) {
   layer_->RemoveAnimation(
       animation_id, static_cast<Animation::TargetProperty>(target_property));
 }
 
 void WebLayerImpl::pauseAnimation(int animation_id, double time_offset) {
   layer_->PauseAnimation(animation_id, time_offset);
 }
 
+void WebLayerImpl::abortAnimation(int animation_id) {
+  layer_->AbortAnimation(animation_id);
+}
+
 bool WebLayerImpl::hasActiveAnimation() {
   return layer_->HasActiveAnimation();
 }
 
 void WebLayerImpl::setForceRenderSurface(bool force_render_surface) {
   layer_->SetForceRenderSurface(force_render_surface);
 }
 
 void WebLayerImpl::setScrollPositionDouble(blink::WebDoublePoint position) {
   layer_->SetScrollOffset(gfx::ScrollOffset(position.x, position.y));
@@ skipping 274 matching lines @@
 
 Layer* WebLayerImpl::layer() const {
   return layer_.get();
 }
 
 void WebLayerImpl::SetContentsOpaqueIsFixed(bool fixed) {
   contents_opaque_is_fixed_ = fixed;
 }
 
 }  // namespace cc_blink