Reland of "Mustash: Ensure surfaces submitted to Mus by WM and embedders contain Surfaces with embe…

services/ui/ws/server_window_compositor_frame_sink_manager.h

Index: services/ui/ws/server_window_compositor_frame_sink_manager.h
diff --git a/services/ui/ws/server_window_compositor_frame_sink_manager.h b/services/ui/ws/server_window_compositor_frame_sink_manager.h
index 8ca40a348a459dbb36e3515d6cc24860e8cfd67d..eb21737d9defb788bbfc88377199030a5f81d743 100644
--- a/services/ui/ws/server_window_compositor_frame_sink_manager.h
+++ b/services/ui/ws/server_window_compositor_frame_sink_manager.h
@@ -109,6 +109,8 @@ class ServerWindowCompositorFrameSinkManager {
 
   TypeToCompositorFrameSinkMap type_to_compositor_frame_sink_map_;
 
+  // TODO(mfomitchev): This is currently always false. Confirm if we still need
+  // this.
   // While true the window is not drawn. This is initially true if the window
   // has the property |kWaitForUnderlay_Property|. This is set to false once
   // the underlay and default surface have been set *and* their size is at