Mustash: Ensure surfaces submitted to Mus by WM and embedders contain Surfaces with embeded content.

services/ui/ws/server_window_compositor_frame_sink_manager.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SERVICES_UI_WS_SERVER_WINDOW_COMPOSITOR_FRAME_SINK_MANAGER_H_
 #define SERVICES_UI_WS_SERVER_WINDOW_COMPOSITOR_FRAME_SINK_MANAGER_H_
 
 #include <map>
 
 #include "base/macros.h"
@@ skipping 93 matching lines @@
       cc::mojom::MojoCompositorFrameSinkClientPtr client,
       cc::mojom::DisplayPrivateRequest display_private_request);
 
   ServerWindow* window_;
 
   using TypeToCompositorFrameSinkMap =
       std::map<mojom::CompositorFrameSinkType, CompositorFrameSinkData>;
 
   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
   // least that of the window. Ideally we would wait for sizes to match, but
   // the underlay is not necessarily as big as the window.
   bool waiting_for_initial_frames_;
 
   DISALLOW_COPY_AND_ASSIGN(ServerWindowCompositorFrameSinkManager);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_SERVER_WINDOW_COMPOSITOR_FRAME_SINK_MANAGER_H_