Implement aura::WindowPortMus::CreateCompositorFrameSink()

services/ui/ws/window_tree.cc

Index: services/ui/ws/window_tree.cc
diff --git a/services/ui/ws/window_tree.cc b/services/ui/ws/window_tree.cc
index 421b1972ee5788f2ba37a7eb021086b3dbcb1a52..39b3f90cc98f6411519b4a9772fa484858c2e0a5 100644
--- a/services/ui/ws/window_tree.cc
+++ b/services/ui/ws/window_tree.cc
@@ -2146,6 +2146,15 @@ void WindowTree::CancelWindowMove(Id window_id) {
       window_server_->GetCurrentMoveLoopChangeId());
 }
 
+void WindowTree::GetFrameSinkId(Id window_id) {
+  ServerWindow* window = GetWindowByClientId(ClientWindowId(window_id));
+  if (!window) {
+    DVLOG(1) << "GetFrameSinkId failed (invalid window id)";
+    return;
+  }
+  client()->OnFrameSinkIdAllocated(window_id, window->frame_sink_id());
+}
+
 void WindowTree::AddAccelerators(
     std::vector<mojom::WmAcceleratorPtr> accelerators,
     const AddAcceleratorsCallback& callback) {