mus: Make sure window parenting happens in the window server.

services/ui/ws/window_server.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_server.h"
 
 #include <set>
 #include <string>
 
 #include "base/logging.h"
@@ skipping 491 matching lines @@
 
 WindowTree* WindowServer::GetCurrentDragLoopInitiator() {
   if (current_drag_loop_)
     return current_drag_loop_->initiator;
   return nullptr;
 }
 
 void WindowServer::OnDisplayReady(Display* display, bool is_first) {
   if (is_first)
     delegate_->OnFirstDisplayReady();
+  gpu_host_->OnAcceleratedWidgetAvailable(
+      display->platform_display()->GetAcceleratedWidget());
+}
+
+void WindowServer::OnDisplayDestroyed(Display* display) {
+  gpu_host_->OnAcceleratedWidgetDestroyed(
+      display->platform_display()->GetAcceleratedWidget());
 }
 
 void WindowServer::OnNoMoreDisplays() {
   delegate_->OnNoMoreDisplays();
 }
 
 WindowManagerState* WindowServer::GetWindowManagerStateForUser(
     const UserId& user_id) {
   return window_manager_window_tree_factory_set_.GetWindowManagerStateForUser(
       user_id);
@@ skipping 295 matching lines @@
 void WindowServer::OnUserIdAdded(const UserId& id) {
   activity_monitor_map_[id] = base::MakeUnique<UserActivityMonitor>(nullptr);
 }
 
 void WindowServer::OnUserIdRemoved(const UserId& id) {
   activity_monitor_map_.erase(id);
 }
 
 }  // namespace ws
 }  // namespace ui