Implement aura::Window::CreateCompositorFrameSink()

ui/aura/mus/window_port_mus.h

Index: ui/aura/mus/window_port_mus.h
diff --git a/ui/aura/mus/window_port_mus.h b/ui/aura/mus/window_port_mus.h
index 8c102005b4d03bdc8a6e0e3b2a3d6e4bb19b0093..9200ce02da415e6505ac486084d8304cd7654f4f 100644
--- a/ui/aura/mus/window_port_mus.h
+++ b/ui/aura/mus/window_port_mus.h
@@ -262,6 +262,10 @@ class AURA_EXPORT WindowPortMus : public WindowPort, public WindowMus {
   void OnPropertyChanged(const void* key,
                          int64_t old_value,
                          std::unique_ptr<ui::PropertyData> data) override;
+  std::unique_ptr<cc::CompositorFrameSink> CreateCompositorFrameSink() override;
+  cc::SurfaceId GetSurfaceId() const override;
+  void OnWindowAddedToRootWindow() override {}
+  void OnWindowRemovingFromRootWindow() override {}
 
   void UpdatePrimarySurfaceInfo();
   void UpdateClientSurfaceEmbedder();