Add/remove surface references via MojoCompositorFrameSink.

services/ui/surfaces/gpu_compositor_frame_sink.cc

Index: services/ui/surfaces/gpu_compositor_frame_sink.cc
diff --git a/services/ui/surfaces/gpu_compositor_frame_sink.cc b/services/ui/surfaces/gpu_compositor_frame_sink.cc
index 22f127935e215bcbffef2482c5e9118c118e89c7..af09469886e941e638ba793bff6af8c2cfda69ae 100644
--- a/services/ui/surfaces/gpu_compositor_frame_sink.cc
+++ b/services/ui/surfaces/gpu_compositor_frame_sink.cc
@@ -47,6 +47,16 @@ void GpuCompositorFrameSink::SubmitCompositorFrame(
   support_.SubmitCompositorFrame(local_frame_id, std::move(frame));
 }
 
+void GpuCompositorFrameSink::AddSurfaceReferences(
+    const std::vector<cc::SurfaceReference>& references) {
+  display_compositor_->AddSurfaceReferences(references);
+}
+
+void GpuCompositorFrameSink::RemoveSurfaceReferences(
+    const std::vector<cc::SurfaceReference>& references) {
+  display_compositor_->RemoveSurfaceReferences(references);
+}
+
 void GpuCompositorFrameSink::DidReceiveCompositorFrameAck() {
   client_->DidReceiveCompositorFrameAck();
 }