cc: Commit directly to active tree when using single thread.

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"
 
 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_;
 }
 
 bool FakeProxy::BeginMainFrameRequested() const { return false; }
 
@@ skipping 10 matching lines @@
 bool FakeProxy::SupportsImplScrolling() const { return false; }
 
 bool FakeProxy::MainFrameWillHappenForTesting() {
   return false;
 }
 
 void FakeProxy::AsValueInto(base::trace_event::TracedValue*) const {
 }
 
 }  // namespace cc