CC Animations: Make LayerAnimationController creation optional

content/test/web_layer_tree_view_impl_for_testing.cc

Index: content/test/web_layer_tree_view_impl_for_testing.cc
diff --git a/content/test/web_layer_tree_view_impl_for_testing.cc b/content/test/web_layer_tree_view_impl_for_testing.cc
index 1b2f5f6e5600fb7425a28eb62abd2699f54fbc7d..001202d14bb15b52a7fe744fd6f17be2909bd7fd 100644
--- a/content/test/web_layer_tree_view_impl_for_testing.cc
+++ b/content/test/web_layer_tree_view_impl_for_testing.cc
@@ -159,6 +159,13 @@ void WebLayerTreeViewImplForTesting::DidFailToInitializeOutputSurface() {
   RequestNewOutputSurface();
 }
 
+void WebLayerTreeViewImplForTesting::registerForAnimations(
+    blink::WebLayer* layer) {
+  cc::Layer* cc_layer = static_cast<cc_blink::WebLayerImpl*>(layer)->layer();
+  cc_layer->RegisterForAnimations(layer_tree_host_->animation_registrar(),
+                                  layer_tree_host_->settings());
+}
+
 void WebLayerTreeViewImplForTesting::registerViewportLayers(
     const blink::WebLayer* overscrollElasticityLayer,
     const blink::WebLayer* pageScaleLayer,