cc: Defer first OutputSurface creation until client is ready

cc/trees/proxy.h

Index: cc/trees/proxy.h
diff --git a/cc/trees/proxy.h b/cc/trees/proxy.h
index 69975a6dd7f39a4632152d9f47c0b0f95023959b..4ac266abcf30519c201645f16e72abe5cc03491b 100644
--- a/cc/trees/proxy.h
+++ b/cc/trees/proxy.h
@@ -54,7 +54,8 @@ class CC_EXPORT Proxy {
 
   // Indicates that the compositing surface associated with our context is
   // ready to use.
-  virtual void SetLayerTreeHostClientReady() = 0;
+  virtual void SetLayerTreeHostClientReady(
+      scoped_ptr<OutputSurface> first_output_surface) = 0;
 
   virtual void SetVisible(bool visible) = 0;
 
@@ -84,7 +85,7 @@ class CC_EXPORT Proxy {
   virtual bool BeginMainFrameRequested() const = 0;
 
   // Must be called before using the proxy.
-  virtual void Start(scoped_ptr<OutputSurface> first_output_surface) = 0;
+  virtual void Start() = 0;
   virtual void Stop() = 0;   // Must be called before deleting the proxy.
 
   // Forces 3D commands on all contexts to wait for all previous SwapBuffers