Enable accelerated animations for orphaned layers

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 2013 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 "content/renderer/gpu/render_widget_compositor.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
 #include "base/time.h"
@@ skipping 317 matching lines @@
   base::TimeTicks frame_begin_time =
     base::TimeTicks::FromInternalValue(frame_begin_time_sec *
                                        base::Time::kMicrosecondsPerSecond);
   layer_tree_host_->updateAnimations(frame_begin_time);
 }
 
 void RenderWidgetCompositor::didStopFlinging() {
   layer_tree_host_->didStopFlinging();
 }
 
+void RenderWidgetCompositor::registerForAnimations(WebKit::WebLayer* layer) {
+  cc::Layer* cc_layer = static_cast<WebKit::WebLayerImpl*>(layer)->layer();
+  cc_layer->layerAnimationController()->setAnimationRegistrar(
+      layer_tree_host_->animationRegistrar());
+}
+
 bool RenderWidgetCompositor::compositeAndReadback(void *pixels,
                                                   const WebRect& rect) {
   return layer_tree_host_->compositeAndReadback(pixels, rect);
 }
 
 void RenderWidgetCompositor::finishAllRendering() {
   layer_tree_host_->finishAllRendering();
 }
 
 void RenderWidgetCompositor::setDeferCommits(bool defer_commits) {
@@ skipping 86 matching lines @@
   widget_->didCompleteSwapBuffers();
 }
 
 // TODO(jamesr): This goes through WebViewImpl just to do suppression, refactor
 // that piece out.
 void RenderWidgetCompositor::scheduleComposite() {
   client_->scheduleComposite();
 }
 
 }  // namespace content