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

cc/test/fake_proxy.h

 // 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.
 
 #ifndef CC_TEST_FAKE_PROXY_H_
 #define CC_TEST_FAKE_PROXY_H_
 
 #include "base/single_thread_task_runner.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/proxy.h"
 
 namespace cc {
 
 class FakeProxy : public Proxy {
  public:
   FakeProxy() : Proxy(NULL, NULL), layer_tree_host_(NULL) {}
   explicit FakeProxy(
       scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner)
       : Proxy(main_task_runner, impl_task_runner), layer_tree_host_(NULL) {}
 
   void SetLayerTreeHost(LayerTreeHost* host);
 
   void FinishAllRendering() override {}
   bool IsStarted() const override;
+  bool CommitToActiveTree() const override;
   void SetOutputSurface(scoped_ptr<OutputSurface>) override {}
   void SetLayerTreeHostClientReady() override {}
   void SetVisible(bool visible) override {}
   void SetThrottleFrameProduction(bool throttle) override {}
   const RendererCapabilities& GetRendererCapabilities() const override;
   void SetNeedsAnimate() override {}
   void SetNeedsUpdateLayers() override {}
   void SetNeedsCommit() override {}
   void SetNeedsRedraw(const gfx::Rect& damage_rect) override {}
   void SetNextCommitWaitsForActivation() override {}
@@ skipping 17 matching lines @@
 
  private:
   RendererCapabilities capabilities_;
   size_t max_partial_texture_updates_;
   LayerTreeHost* layer_tree_host_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_PROXY_H_