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 889cfa46697fc8410f43589a31fb2f785b570f2a..41930b1656d7daaa9e36f1cf4f6a63fbedc92746 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::LocalSurfaceId&, const gfx::Size&)>;
+  // Set a callback which will be called when the surface is changed.
+  void SetSurfaceChangedCallback(const SurfaceChangedCallback& callback);

[Fady Samuel, 2017/05/18 16:48:50]

This is fundamentally not compatible with surface synchronization. Please rely
on the window server's OnWindowSurfaceChanged message.

[Peng, 2017/05/18 19:37:59]

Done.

+
   // cc::CompositorFrameSink implementation.
   bool BindToClient(cc::CompositorFrameSinkClient* client) override;
   void DetachFromClient() override;
@@ -68,6 +74,7 @@ class ClientCompositorFrameSink
       client_binding_;
   std::unique_ptr<base::ThreadChecker> thread_checker_;
   const bool enable_surface_synchronization_;
+  SurfaceChangedCallback surface_changed_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientCompositorFrameSink);
 };