cc: Make separate interface for BeginFrame ipc from OutputSurface

cc/output/output_surface.h

Index: cc/output/output_surface.h
diff --git a/cc/output/output_surface.h b/cc/output/output_surface.h
index c79f770be920fb024a7918a836c11d35a578d09e..e9a1a903817b918fee22ced1df05916bd2d35ede 100644
--- a/cc/output/output_surface.h
+++ b/cc/output/output_surface.h
@@ -121,11 +121,6 @@ class CC_EXPORT OutputSurface {
   // processing should be stopped, or lowered in priority.
   virtual void UpdateSmoothnessTakesPriority(bool prefer_smoothness) {}
 
-  // Requests a BeginFrame notification from the output surface. The
-  // notification will be delivered by calling
-  // OutputSurfaceClient::BeginFrame until the callback is disabled.
-  virtual void SetNeedsBeginFrame(bool enable) {}
-
   bool HasClient() { return !!client_; }
 
   // Get the class capable of informing cc of hardware overlay capability.