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..d2fc405e934f5652e25daafef07e8665b4a22c84 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -58,7 +58,7 @@ 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;
@@ -222,9 +222,6 @@ class ThreadProxy : public Proxy,
   bool manage_tiles_pending_;
   // Weak pointer to use when posting tasks to the impl thread.
   base::WeakPtr<ThreadProxy> impl_thread_weak_ptr_;
-  // Holds the first output surface passed from Start. Should not be used for
-  // anything else.
-  scoped_ptr<OutputSurface> first_output_surface_;
 
   // Accessed on the main thread, or when main thread is blocked.
   bool commit_waits_for_activation_;