Convert mustash use surface references.

services/ui/ws/window_server.cc

Index: services/ui/ws/window_server.cc
diff --git a/services/ui/ws/window_server.cc b/services/ui/ws/window_server.cc
index 6fc2028621bedb8e362d42941e131bc109e7091a..46fe9bff36a9e04eaeeb652fa377c24dc08f7024 100644
--- a/services/ui/ws/window_server.cc
+++ b/services/ui/ws/window_server.cc
@@ -771,6 +771,13 @@ void WindowServer::OnSurfaceCreated(const cc::SurfaceId& surface_id,
   window->GetOrCreateCompositorFrameSinkManager()->SetLatestSurfaceInfo(
       compositor_frame_sink_type, surface_id, frame_size);
 
+  // FrameGenerator will add an appropriate reference for the new surface.
+  DCHECK(display_manager_->GetDisplayContaining(window));
+  display_manager_->GetDisplayContaining(window)
+      ->platform_display()
+      ->GetFrameGenerator()
+      ->AddSurfaceReference(surface_id, window);
+
   // This is only used for testing to observe that a window has a
   // CompositorFrame.
   if (!window_paint_callback_.is_null())