Fix GPU service and display initialization race.

services/ui/service.h

 // 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.
 
 #ifndef SERVICES_UI_SERVICE_H_
 #define SERVICES_UI_SERVICE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 87 matching lines @@
   UserState* GetUserState(const service_manager::Identity& remote_identity);
 
   void AddUserIfNecessary(const service_manager::Identity& remote_identity);
 
   // service_manager::Service:
   void OnStart() override;
   bool OnConnect(const service_manager::ServiceInfo& remote_info,
                  service_manager::InterfaceRegistry* registry) override;
 
   // WindowServerDelegate:
+  void StartDisplayInit() override;
   void OnFirstDisplayReady() override;
   void OnNoMoreDisplays() override;
   bool IsTestConfig() const override;
   void UpdateTouchTransforms() override;
 
   // service_manager::InterfaceFactory<mojom::AccessibilityManager>
   // implementation.
   void Create(const service_manager::Identity& remote_identity,
               mojom::AccessibilityManagerRequest request) override;
 
@@ skipping 67 matching lines @@
   std::unique_ptr<ws::TouchController> touch_controller_;
   IMERegistrarImpl ime_registrar_;
   IMEServerImpl ime_server_;
 
   DISALLOW_COPY_AND_ASSIGN(Service);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_SERVICE_H_