Initialize the message center as part of the testing browser process

chrome/browser/browser_process_impl.h

 // Copyright (c) 2012 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.
 
 // When each service is created, we set a flag indicating this. At this point,
 // the service initialization could fail or succeed. This allows us to remember
 // if we tried to create a service, and not try creating it over and over if
 // the creation failed.
 
 #ifndef CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_
@@ skipping 142 matching lines @@
   network_time::NetworkTimeTracker* network_time_tracker() override;
   gcm::GCMDriver* gcm_driver() override;
   memory::TabManager* GetTabManager() override;
   shell_integration::DefaultWebClientState CachedDefaultWebClientState()
       override;
   PhysicalWebDataSource* GetPhysicalWebDataSource() override;
 
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
  private:
+  friend class BrowserProcessImplTest;
+
+  BrowserProcessImpl(base::SequencedTaskRunner* local_state_task_runner,
+                     const base::CommandLine& command_line,
+                     bool initialize_message_center);
   // KeepAliveStateObserver implementation
   void OnKeepAliveStateChanged(bool is_keeping_alive) override;
   void OnKeepAliveRestartStateChanged(bool can_restart) override;
 
   void CreateWatchdogThread();
   void CreateProfileManager();
   void CreateLocalState();
   void CreateViewedPageTracker();
   void CreateIconManager();
   void CreateIntranetRedirectDetector();
@@ skipping 170 matching lines @@
 #if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
   // Any change to this #ifdef must be reflected as well in
   // chrome/browser/memory/tab_manager_browsertest.cc
   std::unique_ptr<memory::TabManager> tab_manager_;
 #endif
 
   shell_integration::DefaultWebClientState cached_default_web_client_state_;
 
   std::unique_ptr<PhysicalWebDataSource> physical_web_data_source_;
 
+  // Whether to skip initialization of the global message center
+  // used in some tests.
+  bool initialize_message_center_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessImpl);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_