Have mash_browser_tests recreate BackgroundServiceManager per test

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 69 matching lines @@
     FORWARDING,
   };
 
   // Holds InterfaceRequests received before the first WindowTreeHost Display
   // has been established.
   struct PendingRequest;
   struct UserState;
 
   using UserIdToUserState = std::map<ws::UserId, std::unique_ptr<UserState>>;
 
-  void InitializeResources(service_manager::Connector* connector);
+  // Attempts to initialize the resource bundle. Returns true if successful,
+  // otherwise false if resources cannot be loaded.
+  bool InitializeResources(service_manager::Connector* connector);
 
   // Returns the user specific state for the user id of |remote_identity|.
   // Service owns the return value.
   // TODO(sky): if we allow removal of user ids then we need to close anything
   // associated with the user (all incoming pipes...) on removal.
   UserState* GetUserState(const service_manager::Identity& remote_identity);
 
   void AddUserIfNecessary(const service_manager::Identity& remote_identity);
 
   // service_manager::Service:
@@ skipping 90 matching lines @@
   // Set to true in StartDisplayInit().
   bool is_gpu_ready_ = false;
   ScreenManagerConfig screen_manager_config_ = ScreenManagerConfig::UNKNOWN;
 
   DISALLOW_COPY_AND_ASSIGN(Service);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_SERVICE_H_