Introduce separate client and init path for single-threaded cc

content/test/web_layer_tree_view_impl_for_testing.h

 // Copyright 2013 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 CONTENT_TEST_WEB_LAYER_TREE_VIEW_IMPL_FOR_TESTING_H_
 #define CONTENT_TEST_WEB_LAYER_TREE_VIEW_IMPL_FOR_TESTING_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/trees/layer_tree_host_client.h"
+#include "cc/trees/layer_tree_host_single_thread_client.h"
 #include "third_party/WebKit/public/platform/WebLayerTreeView.h"
 
 namespace cc {
 class LayerTreeHost;
 }
 
 namespace WebKit { class WebLayer; }
 
 namespace webkit {
 
-class WebLayerTreeViewImplForTesting : public WebKit::WebLayerTreeView,
-                                       public cc::LayerTreeHostClient {
+class WebLayerTreeViewImplForTesting
+    : public WebKit::WebLayerTreeView,
+      public cc::LayerTreeHostClient,
+      public cc::LayerTreeHostSingleThreadClient {
  public:
   WebLayerTreeViewImplForTesting();
   virtual ~WebLayerTreeViewImplForTesting();
 
   bool Initialize();
 
   // WebKit::WebLayerTreeView implementation.
   virtual void setSurfaceReady();
   virtual void setRootLayer(const WebKit::WebLayer& layer);
   virtual void clearRootLayer();
@@ skipping 31 matching lines @@
   virtual void Layout() OVERRIDE;
   virtual void ApplyScrollAndScale(gfx::Vector2d scroll_delta, float page_scale)
       OVERRIDE;
   virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface(bool fallback)
       OVERRIDE;
   virtual void DidInitializeOutputSurface(bool success) OVERRIDE {}
   virtual void WillCommit() OVERRIDE {}
   virtual void DidCommit() OVERRIDE {}
   virtual void DidCommitAndDrawFrame() OVERRIDE {}
   virtual void DidCompleteSwapBuffers() OVERRIDE {}
-  virtual void ScheduleComposite() OVERRIDE;
   virtual scoped_refptr<cc::ContextProvider>
       OffscreenContextProvider() OVERRIDE;
 
+  // cc::LayerTreeHostSingleThreadClient implementation.
+  virtual void ScheduleComposite() OVERRIDE {}
+  virtual void DidPostSwapBuffers() OVERRIDE {}
+  virtual void DidAbortSwapBuffers() OVERRIDE {}
+
  private:
   scoped_ptr<cc::LayerTreeHost> layer_tree_host_;
 
   DISALLOW_COPY_AND_ASSIGN(WebLayerTreeViewImplForTesting);
 };
 
 }  // namespace webkit
 
 #endif  // CONTENT_TEST_WEB_LAYER_TREE_VIEW_IMPL_FOR_TESTING_H_