Implement temporary reference assignment with DisplayCompositor.

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 "base/macros.h"
 #include "cc/ipc/compositor_frame.mojom.h"
 #include "cc/ipc/display_compositor.mojom.h"
 #include "cc/output/context_provider.h"
 #include "cc/surfaces/surface_id.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "services/ui/public/interfaces/window_tree.mojom.h"
 
 namespace ui {
 namespace ws {
 
 class ServerWindow;
-class ServerWindowCompositorFrameSink;
 class ServerWindowCompositorFrameSinkManagerTestApi;
 
 struct CompositorFrameSinkData {
   CompositorFrameSinkData();
   CompositorFrameSinkData(CompositorFrameSinkData&& other);
   ~CompositorFrameSinkData();
 
   CompositorFrameSinkData& operator=(CompositorFrameSinkData&& other);
 
   cc::mojom::MojoCompositorFrameSinkPrivatePtr compositor_frame_sink;
@@ skipping 13 matching lines @@
   void CreateRootCompositorFrameSink(
       gfx::AcceleratedWidget widget,
       cc::mojom::MojoCompositorFrameSinkAssociatedRequest sink_request,
       cc::mojom::MojoCompositorFrameSinkClientPtr client,
       cc::mojom::DisplayPrivateAssociatedRequest display_request);
 
   void CreateCompositorFrameSink(
       cc::mojom::MojoCompositorFrameSinkRequest request,
       cc::mojom::MojoCompositorFrameSinkClientPtr client);
 
+  // Claims this FrameSinkId will embed |surface_id| so it should own the
+  // temporary reference to |surface_id|.
+  void ClaimTemporaryReference(const cc::SurfaceId& surface_id);
+
  private:
   friend class ServerWindowCompositorFrameSinkManagerTestApi;
-  friend class ServerWindowCompositorFrameSink;
 
-  ServerWindow* window_;
+  ServerWindow* const window_;
 
   std::unique_ptr<CompositorFrameSinkData> frame_sink_data_;
 
   DISALLOW_COPY_AND_ASSIGN(ServerWindowCompositorFrameSinkManager);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_SERVER_WINDOW_COMPOSITOR_FRAME_SINK_MANAGER_H_