Trying changes to see the perfomance impact on Mac....

chrome/browser/browser_process_impl.h

 // Copyright (c) 2011 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 39 matching lines @@
   virtual ResourceDispatcherHost* resource_dispatcher_host();
   virtual MetricsService* metrics_service();
   virtual IOThread* io_thread();
   virtual base::Thread* file_thread();
   virtual base::Thread* db_thread();
   virtual base::Thread* process_launcher_thread();
   virtual base::Thread* cache_thread();
 #if defined(USE_X11)
   virtual base::Thread* background_x11_thread();
 #endif
+  virtual WatchDogThread* watchdog_thread();
   virtual ProfileManager* profile_manager();
   virtual PrefService* local_state();
   virtual DevToolsManager* devtools_manager();
   virtual SidebarManager* sidebar_manager();
   virtual ui::Clipboard* clipboard();
   virtual NotificationUIManager* notification_ui_manager();
   virtual policy::BrowserPolicyConnector* browser_policy_connector();
   virtual IconManager* icon_manager();
   virtual ThumbnailGenerator* GetThumbnailGenerator();
   virtual AutomationProviderList* InitAutomationProviderList();
@@ skipping 46 matching lines @@
 
   void CreateIOThread();
   static void CleanupOnIOThread();
 
   void WaitForPluginDataRemoverToFinish();
 
   void CreateFileThread();
   void CreateDBThread();
   void CreateProcessLauncherThread();
   void CreateCacheThread();
+  void CreateWatchdogThread();
   void CreateTemplateURLModel();
   void CreateProfileManager();
   void CreateWebDataService();
   void CreateLocalState();
   void CreateViewedPageTracker();
   void CreateIconManager();
   void CreateDevToolsManager();
   void CreateSidebarManager();
   void CreateGoogleURLTracker();
   void CreateIntranetRedirectDetector();
@@ skipping 27 matching lines @@
 
   bool created_db_thread_;
   scoped_ptr<base::Thread> db_thread_;
 
   bool created_process_launcher_thread_;
   scoped_ptr<base::Thread> process_launcher_thread_;
 
   bool created_cache_thread_;
   scoped_ptr<base::Thread> cache_thread_;
 
+  bool created_watchdog_thread_;
+  scoped_ptr<WatchDogThread> watchdog_thread_;
+
   bool created_profile_manager_;
   scoped_ptr<ProfileManager> profile_manager_;
 
   bool created_local_state_;
   scoped_ptr<PrefService> local_state_;
 
   bool created_icon_manager_;
   scoped_ptr<IconManager> icon_manager_;
 
   scoped_refptr<DevToolsHttpProtocolHandler> devtools_http_handler_;
@@ skipping 80 matching lines @@
   // restarted, and if that's the case, restarts the browser.
   void OnAutoupdateTimer();
   bool CanAutorestartForUpdate() const;
   void RestartPersistentInstance();
 #endif  // defined(OS_WIN) || defined(OS_LINUX)
 
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessImpl);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_