Implement temporary reference assignment with DisplayCompositor.

components/display_compositor/gpu_root_compositor_frame_sink.h

Index: components/display_compositor/gpu_root_compositor_frame_sink.h
diff --git a/components/display_compositor/gpu_root_compositor_frame_sink.h b/components/display_compositor/gpu_root_compositor_frame_sink.h
index a978eb79d659a15e8d334e02160366595212d4e2..3e5a7648a49c37b74f0fe01d0a7fc9bcbc9f20c0 100644
--- a/components/display_compositor/gpu_root_compositor_frame_sink.h
+++ b/components/display_compositor/gpu_root_compositor_frame_sink.h
@@ -9,6 +9,9 @@
 #include "cc/ipc/mojo_compositor_frame_sink.mojom.h"
 #include "cc/surfaces/compositor_frame_sink_support_client.h"
 #include "cc/surfaces/display_client.h"
+#include "cc/surfaces/frame_sink_id.h"
+#include "cc/surfaces/local_surface_id.h"
+#include "cc/surfaces/surface_id.h"
 #include "components/display_compositor/display_compositor_export.h"
 #include "components/display_compositor/gpu_compositor_frame_sink_delegate.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
@@ -18,7 +21,6 @@ namespace cc {
 class BeginFrameSource;
 class CompositorFrameSinkSupport;
 class Display;
-class FrameSinkId;
 class SurfaceManager;
 }
 
@@ -67,6 +69,7 @@ class DISPLAY_COMPOSITOR_EXPORT GpuRootCompositorFrameSink
   void AddChildFrameSink(const cc::FrameSinkId& child_frame_sink_id) override;
   void RemoveChildFrameSink(
       const cc::FrameSinkId& child_frame_sink_id) override;
+  void ClaimTemporaryReference(const cc::SurfaceId& surface_id) override;
   void RequestCopyOfSurface(
       std::unique_ptr<cc::CopyOutputRequest> request) override;