Implement temporary reference assignment with DisplayCompositor.

services/ui/surfaces/display_compositor.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_SURFACES_DISPLAY_COMPOSITOR_H_
 #define SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 64 matching lines @@
       const cc::FrameSinkId& frame_sink_id,
       cc::mojom::MojoCompositorFrameSinkRequest request,
       cc::mojom::MojoCompositorFrameSinkPrivateRequest private_request,
       cc::mojom::MojoCompositorFrameSinkClientPtr client) override;
   void RegisterFrameSinkHierarchy(
       const cc::FrameSinkId& parent_frame_sink_id,
       const cc::FrameSinkId& child_frame_sink_id) override;
   void UnregisterFrameSinkHierarchy(
       const cc::FrameSinkId& parent_frame_sink_id,
       const cc::FrameSinkId& child_frame_sink_id) override;
+  void DropTemporaryReference(const cc::SurfaceId& surface_id) override;
 
  private:
   std::unique_ptr<cc::Display> CreateDisplay(
       const cc::FrameSinkId& frame_sink_id,
       gpu::SurfaceHandle surface_handle,
       cc::SyntheticBeginFrameSource* begin_frame_source);
 
   // It is necessary to pass |frame_sink_id| by value because the id
   // is owned by the GpuCompositorFrameSink in the map. When the sink is
   // removed from the map, |frame_sink_id| would also be destroyed if it were a
@@ skipping 32 matching lines @@
 
   cc::mojom::DisplayCompositorClientPtr client_;
   mojo::Binding<cc::mojom::DisplayCompositor> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayCompositor);
 };
 
 }  // namespace ui
 
 #endif  //  SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_H_