Implement aura::WindowPortMus::CreateCompositorFrameSink()

services/ui/public/cpp/client_compositor_frame_sink.h

Index: services/ui/public/cpp/client_compositor_frame_sink.h
diff --git a/services/ui/public/cpp/client_compositor_frame_sink.h b/services/ui/public/cpp/client_compositor_frame_sink.h
index af5f13a09c3af064a5a3ff992b1b2d64f5e8922d..b785fdf4a7c7cc8e69f68b5ad85f5a70e669a617 100644
--- a/services/ui/public/cpp/client_compositor_frame_sink.h
+++ b/services/ui/public/cpp/client_compositor_frame_sink.h
@@ -5,6 +5,7 @@
 #ifndef SERVICES_UI_PUBLIC_CPP_WINDOW_COMPOSITOR_FRAME_SINK_H_
 #define SERVICES_UI_PUBLIC_CPP_WINDOW_COMPOSITOR_FRAME_SINK_H_
 
+#include "base/callback.h"
 #include "base/macros.h"
 #include "cc/ipc/mojo_compositor_frame_sink.mojom.h"
 #include "cc/output/compositor_frame_sink.h"
@@ -33,6 +34,11 @@ class ClientCompositorFrameSink
 
   ~ClientCompositorFrameSink() override;
 
+  using SurfaceChangedCallback =
+      base::Callback<void(const cc::SurfaceId&, const gfx::Size&)>;
+  // Set a callback which will be called when the surface is changed.
+  void SetSurfaceChangedCallback(const SurfaceChangedCallback& callback);
+
   // cc::CompositorFrameSink implementation.
   bool BindToClient(cc::CompositorFrameSinkClient* client) override;
   void DetachFromClient() override;
@@ -69,6 +75,7 @@ class ClientCompositorFrameSink
   std::unique_ptr<base::ThreadChecker> thread_checker_;
   const cc::FrameSinkId frame_sink_id_;
   bool enable_surface_synchronization_ = false;
+  SurfaceChangedCallback surface_changed_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientCompositorFrameSink);
 };