Give ServerWindowCompositorFrameSinkManager ownership of GpuCompositorFrameSink

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 a473fff5ee2d317b529148d30a3b31b48722073a..746767d18e8bf6d30970dd8a5c4fab105d08f5ce 100644
--- a/services/ui/ws/server_window_compositor_frame_sink_manager.h
+++ b/services/ui/ws/server_window_compositor_frame_sink_manager.h
@@ -22,6 +22,7 @@ class GpuMemoryBufferManager;
 namespace ui {
 namespace ws {
 
+class GpuCompositorFrameSink;
 class ServerWindow;
 class ServerWindowCompositorFrameSink;
 class ServerWindowCompositorFrameSinkManagerTestApi;
@@ -38,6 +39,7 @@ struct CompositorFrameSinkData {
   cc::mojom::MojoCompositorFrameSinkPrivatePtr compositor_frame_sink;
   cc::mojom::MojoCompositorFrameSinkPrivateRequest
       pending_compositor_frame_sink_request;
+  std::unique_ptr<GpuCompositorFrameSink> compositor_frame_sink_impl_;
 };
 
 // ServerWindowCompositorFrameSinkManager tracks the surfaces associated with a