Blink Compositor Animation: Introduce CompositorAnimationHost correctly.

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 <stddef.h>
 #include <limits>
 #include <string>
 #include <utility>
@@ skipping 654 matching lines @@
 
 void RenderWidgetCompositor::setRootLayer(const blink::WebLayer& layer) {
   layer_tree_host_->GetLayerTree()->SetRootLayer(
       static_cast<const cc_blink::WebLayerImpl*>(&layer)->layer());
 }
 
 void RenderWidgetCompositor::clearRootLayer() {
   layer_tree_host_->GetLayerTree()->SetRootLayer(scoped_refptr<cc::Layer>());
 }
 
-void RenderWidgetCompositor::attachCompositorAnimationTimeline(
-    cc::AnimationTimeline* compositor_timeline) {
-  DCHECK(animation_host_);
-  DCHECK(compositor_deps_->IsThreadedAnimationEnabled());
-  animation_host_->AddAnimationTimeline(compositor_timeline);
-}
-
-void RenderWidgetCompositor::detachCompositorAnimationTimeline(
-    cc::AnimationTimeline* compositor_timeline) {
-  DCHECK(animation_host_);
-  DCHECK(compositor_deps_->IsThreadedAnimationEnabled());
-  animation_host_->RemoveAnimationTimeline(compositor_timeline);
+cc::AnimationHost* RenderWidgetCompositor::compositorAnimationHost() {
+  return animation_host_.get();
 }
 
 void RenderWidgetCompositor::setViewportSize(
     const WebSize& device_viewport_size) {
   layer_tree_host_->GetLayerTree()->SetViewportSize(device_viewport_size);
 }
 
 WebSize RenderWidgetCompositor::getViewportSize() const {
   return layer_tree_host_->GetLayerTree()->device_viewport_size();
 }
@@ skipping 444 matching lines @@
     float device_scale) {
   layer_tree_host_->GetLayerTree()->SetPaintedDeviceScaleFactor(device_scale);
 }
 
 void RenderWidgetCompositor::SetDeviceColorSpace(
     const gfx::ColorSpace& color_space) {
   layer_tree_host_->GetLayerTree()->SetDeviceColorSpace(color_space);
 }
 
 }  // namespace content