Draw the offscreen texture to reflector's surface without extra copy

content/browser/compositor/browser_compositor_output_surface.h

Index: content/browser/compositor/browser_compositor_output_surface.h
diff --git a/content/browser/compositor/browser_compositor_output_surface.h b/content/browser/compositor/browser_compositor_output_surface.h
index 615a54e30c5ab928021fa3017529fdaf413ff82e..5c4f30828bfbe44f918a9334d9e286d10745f2c0 100644
--- a/content/browser/compositor/browser_compositor_output_surface.h
+++ b/content/browser/compositor/browser_compositor_output_surface.h
@@ -39,6 +39,13 @@ class CONTENT_EXPORT BrowserCompositorOutputSurface
 
   void SetReflector(ReflectorImpl* reflector);
 
+  // Called when |reflector_| was updated.
+  virtual void OnReflectorChanged();
+
+  // Returns a callback that will be called when all mirroring
+  // compositors have started composition.
+  virtual base::Closure CreateCompositionStartedCallback();
+
 #if defined(OS_MACOSX)
   virtual void OnSurfaceDisplayed() = 0;
   virtual void SetSurfaceSuspendedForRecycle(bool suspended) = 0;