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 487ef4dba3bf40963b51e683c91dfb7deaa23bae..2bf8d89658896b658caea874c33c57641a87b0d6 100644
--- a/services/ui/public/cpp/client_compositor_frame_sink.cc
+++ b/services/ui/public/cpp/client_compositor_frame_sink.cc
@@ -37,6 +37,12 @@ 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))
@@ -56,6 +62,8 @@ bool ClientCompositorFrameSink::BindToClient(
 }
 
 void ClientCompositorFrameSink::DetachFromClient() {
+  if (surface_changed_callback_ && local_surface_id_.is_valid())
+    surface_changed_callback_.Run(cc::LocalSurfaceId(), gfx::Size());
   client_->SetBeginFrameSource(nullptr);
   begin_frame_source_.reset();
   client_binding_.reset();
@@ -80,15 +88,20 @@ 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 (!local_surface_id_.is_valid() ||
       frame_size != last_submitted_frame_size_) {
     last_submitted_frame_size_ = frame_size;
-    if (!enable_surface_synchronization_)
+    if (!enable_surface_synchronization_) {
       local_surface_id_ = id_allocator_.GenerateId();
+      surface_changed = true;
+    }
   }
   compositor_frame_sink_->SubmitCompositorFrame(local_surface_id_,
                                                 std::move(frame));
+  if (surface_changed && surface_changed_callback_)
+    surface_changed_callback_.Run(local_surface_id_, frame_size);
 }
 
 ClientCompositorFrameSink::ClientCompositorFrameSink(