WIP: Propagate SurfaceID up window tree hierarchy

ash/mus/non_client_frame_controller.h

Index: ash/mus/non_client_frame_controller.h
diff --git a/ash/mus/non_client_frame_controller.h b/ash/mus/non_client_frame_controller.h
index d1bb499c9f9f01c89debfe3b698ba1e5ef897d53..5046c1e40344f6471ede65096ae72cbbfc8c1a22 100644
--- a/ash/mus/non_client_frame_controller.h
+++ b/ash/mus/non_client_frame_controller.h
@@ -74,6 +74,12 @@ class NonClientFrameController : public views::WidgetDelegateView,
                                     const void* key,
                                     intptr_t old) override;
   void OnWindowDestroyed(ui::Window* window) override;
+  void OnChildWindowSurfaceCreated(
+      ui::Window* window,
+      const gfx::Size& size,
+      float device_scale_factor,
+      const cc::SurfaceId& surface_id,
+      const cc::SurfaceSequence& surface_sequence) override;
 
   views::Widget* widget_;