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 "cc/ipc/display_compositor.mojom.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "services/ui/ws/ids.h"
 #include "services/ui/ws/server_window.h"
@@ skipping 49 matching lines @@
   } else {
     private_request =
         mojo::MakeRequest(&frame_sink_data_->compositor_frame_sink);
   }
 
   window_->delegate()->GetDisplayCompositor()->CreateCompositorFrameSink(
       window_->frame_sink_id(), std::move(request), std::move(private_request),
       std::move(client));
 }
 
+void ServerWindowCompositorFrameSinkManager::ClaimTemporaryReference(
+    const cc::SurfaceId& surface_id) {
+  if (!frame_sink_data_) {
+    frame_sink_data_ = base::MakeUnique<CompositorFrameSinkData>();
+    frame_sink_data_->pending_compositor_frame_sink_request =
+        mojo::MakeRequest(&frame_sink_data_->compositor_frame_sink);
+  }
+  frame_sink_data_->compositor_frame_sink->ClaimTemporaryReference(surface_id);
+}
+
 CompositorFrameSinkData::CompositorFrameSinkData() {}
 
 CompositorFrameSinkData::~CompositorFrameSinkData() {}
 
 CompositorFrameSinkData::CompositorFrameSinkData(
     CompositorFrameSinkData&& other)
     : compositor_frame_sink(std::move(other.compositor_frame_sink)) {}
 
 CompositorFrameSinkData& CompositorFrameSinkData::operator=(
     CompositorFrameSinkData&& other) {
   compositor_frame_sink = std::move(other.compositor_frame_sink);
   return *this;
 }
 
 }  // namespace ws
 }  // namespace ui