Implement aura::Window::CreateCompositorFrameSink()

ui/aura/window.h

Index: ui/aura/window.h
diff --git a/ui/aura/window.h b/ui/aura/window.h
index 96fa4fe5c010acd2b31ecfc7535248c9bb9af823..76f993405a2a24c52e68a10ddf9cba4b70f6b400 100644
--- a/ui/aura/window.h
+++ b/ui/aura/window.h
@@ -31,6 +31,10 @@
 #include "ui/gfx/native_widget_types.h"
 #include "ui/wm/public/window_types.h"
 
+namespace cc {
+class CompositorFrameSink;
+}
+
 namespace display {
 class Display;
 }
@@ -304,6 +308,10 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   // Returns true if there was state needing to be cleaned up.
   bool CleanupGestureState();
 
+  // Create a CompositorFrameSink for the aura::Window. It will replace the old
+  // one created by this function.
+  std::unique_ptr<cc::CompositorFrameSink> CreateCompositorFrameSink();
+
  protected:
   // Deletes (or removes if not owned by parent) all child windows. Intended for
   // use from the destructor.