Implement temporary reference assignment with DisplayCompositor.

services/ui/ws/server_window_compositor_frame_sink_manager.cc

Index: services/ui/ws/server_window_compositor_frame_sink_manager.cc
diff --git a/services/ui/ws/server_window_compositor_frame_sink_manager.cc b/services/ui/ws/server_window_compositor_frame_sink_manager.cc
index 4849b90a10528079b581b1a53eca032ff68f6bc7..e76f91caec2dc4b6a34787f01531d824f2e3e911 100644
--- a/services/ui/ws/server_window_compositor_frame_sink_manager.cc
+++ b/services/ui/ws/server_window_compositor_frame_sink_manager.cc
@@ -67,6 +67,16 @@ void ServerWindowCompositorFrameSinkManager::CreateCompositorFrameSink(
       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() {}