compositor-worker: Initialize CW machinery plumbing to compositor and fire CW rAF callbacks.

cc/test/fake_proxy.cc

 // Copyright 2012 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 "cc/test/fake_proxy.h"
 
+#include "cc/animation/layer_tree_mutator.h"
+
 namespace cc {
 
 void FakeProxy::SetLayerTreeHost(LayerTreeHost* host) {
   layer_tree_host_ = host;
 }
 
 bool FakeProxy::IsStarted() const { return true; }
 
 bool FakeProxy::CommitToActiveTree() const {
   return false;
 }
 
 const RendererCapabilities& FakeProxy::GetRendererCapabilities() const {
   return capabilities_;
 }
 
 RendererCapabilities& FakeProxy::GetRendererCapabilities() {
   return capabilities_;
 }
 
 void FakeProxy::ReleaseOutputSurface() {}
 
 bool FakeProxy::BeginMainFrameRequested() const { return false; }
 
 bool FakeProxy::CommitRequested() const { return false; }
 
+void FakeProxy::SetMutator(std::unique_ptr<LayerTreeMutator> mutator) {}
+
 bool FakeProxy::SupportsImplScrolling() const {
   return true;
 }
 
 bool FakeProxy::MainFrameWillHappenForTesting() {
   return false;
 }
 
 }  // namespace cc