CC Animations: Make LayerAnimationController creation optional

components/html_viewer/web_layer_tree_view_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 "components/html_viewer/web_layer_tree_view_impl.h"
 
 #include "base/thread_task_runner_handle.h"
 #include "cc/blink/web_layer_impl.h"
 #include "cc/layers/layer.h"
 #include "cc/output/begin_frame_args.h"
@@ skipping 162 matching lines @@
 
 void WebLayerTreeViewImpl::setPageScaleFactorAndLimits(float page_scale_factor,
                                                        float minimum,
                                                        float maximum) {
   layer_tree_host_->SetPageScaleFactorAndLimits(
       page_scale_factor, minimum, maximum);
 }
 
 void WebLayerTreeViewImpl::registerForAnimations(blink::WebLayer* layer) {
   cc::Layer* cc_layer = static_cast<cc_blink::WebLayerImpl*>(layer)->layer();
-  cc_layer->layer_animation_controller()->SetAnimationRegistrar(
-      layer_tree_host_->animation_registrar());
+  cc_layer->RegisterForAnimations(layer_tree_host_->animation_registrar());
 }
 
 void WebLayerTreeViewImpl::registerViewportLayers(
     const blink::WebLayer* overscrollElasticityLayer,
     const blink::WebLayer* pageScaleLayer,
     const blink::WebLayer* innerViewportScrollLayer,
     const blink::WebLayer* outerViewportScrollLayer) {
   layer_tree_host_->RegisterViewportLayers(
       // The scroll elasticity layer will only exist when using pinch virtual
       // viewports.
@@ skipping 51 matching lines @@
       base::Bind(&WebLayerTreeViewImpl::DidCreateSurfaceOnMainThread,
                  main_thread_bound_weak_ptr_,
                  id));
 }
 
 void WebLayerTreeViewImpl::DidCreateSurfaceOnMainThread(cc::SurfaceId id) {
   view_->SetSurfaceId(mojo::SurfaceId::From(id));
 }
 
 }  // namespace html_viewer