Implement aura::Window::CreateCompositorFrameSink()

ui/aura/mus/window_port_mus.cc

Index: ui/aura/mus/window_port_mus.cc
diff --git a/ui/aura/mus/window_port_mus.cc b/ui/aura/mus/window_port_mus.cc
index 4c605a06f0416bb5186802a7eaa19792e05256e0..4c98ed4558a036614237a01cf0d8aa1497009064 100644
--- a/ui/aura/mus/window_port_mus.cc
+++ b/ui/aura/mus/window_port_mus.cc
@@ -520,6 +520,17 @@ void WindowPortMus::OnPropertyChanged(const void* key,
                                                     std::move(data));
 }
 
+std::unique_ptr<cc::CompositorFrameSink>
+WindowPortMus::CreateCompositorFrameSink() {
+  // TODO(penghuang): Implement it for Mus.
+  return nullptr;
+}
+
+cc::SurfaceId WindowPortMus::GetSurfaceId() const {
+  // TODO(penghuang): Implement it for Mus.
+  return cc::SurfaceId();
+}
+
 void WindowPortMus::UpdatePrimarySurfaceInfo() {
   bool embeds_surface = window_mus_type() == WindowMusType::TOP_LEVEL_IN_WM ||
                         window_mus_type() == WindowMusType::EMBED_IN_OWNER;