Implement temporary reference assignment with DisplayCompositor.

services/ui/ws/server_window_compositor_frame_sink_manager.cc

 // 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.
 
 #include "services/ui/ws/server_window_compositor_frame_sink_manager.h"
 
 #include <utility>
 
 #include "cc/ipc/display_compositor.mojom.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
@@ skipping 37 matching lines @@
   if (!pending_compositor_frame_sink_request_.is_pending()) {
     pending_compositor_frame_sink_request_ =
         mojo::MakeRequest(&compositor_frame_sink_);
   }
 
   window_->delegate()->GetDisplayCompositor()->CreateCompositorFrameSink(
       window_->frame_sink_id(), std::move(request),
       std::move(pending_compositor_frame_sink_request_), std::move(client));
 }
 
+void ServerWindowCompositorFrameSinkManager::ClaimTemporaryReference(
+    const cc::SurfaceId& surface_id) {
+  if (!compositor_frame_sink_.is_bound()) {
+    pending_compositor_frame_sink_request_ =
+        mojo::MakeRequest(&compositor_frame_sink_);
+  }
+  compositor_frame_sink_->ClaimTemporaryReference(surface_id);
+}
+
 }  // namespace ws
 }  // namespace ui