CC Animations: Make LayerAnimationController creation optional

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 1835121df0d180053a0ccf3d88218f6cb70dce8e..64ce90f897ce02109d5849c84300cf8e1cac95fa 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -661,8 +661,8 @@ void RenderWidgetCompositor::didStopFlinging() {
 
 void RenderWidgetCompositor::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(),
+                                  layer_tree_host_->settings());
 }
 
 void RenderWidgetCompositor::registerViewportLayers(