Implement aura::WindowPortMus::CreateCompositorFrameSink()

services/ui/public/cpp/client_compositor_frame_sink.cc

Index: services/ui/public/cpp/client_compositor_frame_sink.cc
diff --git a/services/ui/public/cpp/client_compositor_frame_sink.cc b/services/ui/public/cpp/client_compositor_frame_sink.cc
index ef014e05ae77d58a8dbc11cf528072e859106aa0..830321a6d4aff4afee6cef97dc8395203032c3d5 100644
--- a/services/ui/public/cpp/client_compositor_frame_sink.cc
+++ b/services/ui/public/cpp/client_compositor_frame_sink.cc
@@ -38,6 +38,12 @@ std::unique_ptr<ClientCompositorFrameSink> ClientCompositorFrameSink::Create(
 
 ClientCompositorFrameSink::~ClientCompositorFrameSink() {}
 
+void ClientCompositorFrameSink::SetSurfaceChangedCallback(
+    const SurfaceChangedCallback& callback) {
+  DCHECK(!surface_changed_callback_);
+  surface_changed_callback_ = callback;
+}
+
 bool ClientCompositorFrameSink::BindToClient(
     cc::CompositorFrameSinkClient* client) {
   if (!cc::CompositorFrameSink::BindToClient(client))
@@ -81,15 +87,21 @@ void ClientCompositorFrameSink::SubmitCompositorFrame(
   DCHECK_LE(cc::BeginFrameArgs::kStartingFrameNumber,
             frame.metadata.begin_frame_ack.sequence_number);
 
+  bool surface_changed = false;
   gfx::Size frame_size = frame.render_pass_list.back()->output_rect.size();
   if (!enable_surface_synchronization_ &&
       (!local_surface_id_.is_valid() ||
        frame_size != last_submitted_frame_size_)) {
     local_surface_id_ = id_allocator_.GenerateId();
+    last_submitted_frame_size_ = frame_size;
+    surface_changed = true;
   }
   compositor_frame_sink_->SubmitCompositorFrame(local_surface_id_,
                                                 std::move(frame));
-  last_submitted_frame_size_ = frame_size;
+  if (surface_changed && surface_changed_callback_) {
+    surface_changed_callback_.Run(
+        cc::SurfaceId(frame_sink_id_, local_surface_id_), frame_size);
+  }
 }
 
 ClientCompositorFrameSink::ClientCompositorFrameSink(