cc: Defer first OutputSurface creation until client is ready

cc/trees/thread_proxy.h

Index: cc/trees/thread_proxy.h
diff --git a/cc/trees/thread_proxy.h b/cc/trees/thread_proxy.h
index 9a585ad2dfdc151d85fddc0dd44c12dd96195892..6bce4eb748d3a13586cb69f35a96c7f993a3487e 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -44,7 +44,8 @@ class ThreadProxy : public Proxy,
   virtual bool CompositeAndReadback(void* pixels, gfx::Rect rect) OVERRIDE;
   virtual void FinishAllRendering() OVERRIDE;
   virtual bool IsStarted() const OVERRIDE;
-  virtual void SetLayerTreeHostClientReady() OVERRIDE;
+  virtual void SetLayerTreeHostClientReady(
+      scoped_ptr<OutputSurface> first_output_surface) OVERRIDE;
   virtual void SetVisible(bool visible) OVERRIDE;
   virtual void CreateAndInitializeOutputSurface() OVERRIDE;
   virtual const RendererCapabilities& GetRendererCapabilities() const OVERRIDE;
@@ -58,7 +59,7 @@ class ThreadProxy : public Proxy,
   virtual bool CommitRequested() const OVERRIDE;
   virtual bool BeginMainFrameRequested() const OVERRIDE;
   virtual void MainThreadHasStoppedFlinging() OVERRIDE;
-  virtual void Start(scoped_ptr<OutputSurface> first_output_surface) OVERRIDE;
+  virtual void Start() OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual size_t MaxPartialTextureUpdates() const OVERRIDE;
   virtual void AcquireLayerTextures() OVERRIDE;