Make cc output surface creation async

cc/trees/single_thread_proxy.h

Index: cc/trees/single_thread_proxy.h
diff --git a/cc/trees/single_thread_proxy.h b/cc/trees/single_thread_proxy.h
index b3a55b40d07568d0ca19aac90cdef0af65f0c185..fc11a7eaa77b70d7e7edc39be23b175fd3e607ff 100644
--- a/cc/trees/single_thread_proxy.h
+++ b/cc/trees/single_thread_proxy.h
@@ -34,6 +34,7 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   // Proxy implementation
   virtual void FinishAllRendering() OVERRIDE;
   virtual bool IsStarted() const OVERRIDE;
+  virtual void SetOutputSurface(scoped_ptr<OutputSurface>) OVERRIDE;
   virtual void SetLayerTreeHostClientReady() OVERRIDE;
   virtual void SetVisible(bool visible) OVERRIDE;
   virtual const RendererCapabilities& GetRendererCapabilities() const OVERRIDE;
@@ -106,9 +107,7 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   virtual void DidManageTiles() OVERRIDE;
   virtual void SetDebugState(const LayerTreeDebugState& debug_state) OVERRIDE {}
 
-  // Attempts to create the context and renderer synchronously. Calls
-  // LayerTreeHost::OnCreateAndInitializeOutputSurfaceAttempted with the result.
-  void CreateAndInitializeOutputSurface();
+  void RequestNewOutputSurface();
 
   // Called by the legacy path where RenderWidget does the scheduling.
   void CompositeImmediately(base::TimeTicks frame_begin_time);