Implement aura::WindowPortMus::CreateCompositorFrameSink()

services/ui/ws/window_tree.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "services/ui/ws/window_tree.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 2129 matching lines @@
   if (!display_root) {
     DVLOG(1) << "CancelWindowMove failed (no such window manager display root)";
     return;
   }
 
   WindowManagerState* wms = display_root->window_manager_state();
   wms->window_tree()->window_manager_internal_->WmCancelMoveLoop(
       window_server_->GetCurrentMoveLoopChangeId());
 }
 
+void WindowTree::GetFrameSinkId(Id window_id,
+                                const GetFrameSinkIdCallback& callback) {
+  ServerWindow* window = GetWindowByClientId(ClientWindowId(window_id));
+  if (!window) {
+    DVLOG(1) << "GetFrameSinkId failed (invalid window id)";
+    callback.Run(base::Optional<cc::FrameSinkId>());
+    return;
+  }
+  callback.Run(window->frame_sink_id());
+}
+
 void WindowTree::AddAccelerators(
     std::vector<mojom::WmAcceleratorPtr> accelerators,
     const AddAcceleratorsCallback& callback) {
   DCHECK(window_manager_state_);
 
   bool success = true;
   for (auto iter = accelerators.begin(); iter != accelerators.end(); ++iter) {
     if (!window_manager_state_->event_dispatcher()->AddAccelerator(
             iter->get()->id, std::move(iter->get()->event_matcher)))
       success = false;
@@ skipping 323 matching lines @@
   client()->OnCompleteDrop(client_window_id.id, event_flags, cursor_offset,
                            effect_bitmask, callback);
 }
 
 void WindowTree::PerformOnDragDropDone() {
   client()->OnDragDropDone();
 }
 
 }  // namespace ws
 }  // namespace ui