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

chrome/test/testing_browser_process.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.
 
 // An implementation of BrowserProcess for unit tests that fails for most
 // services. By preventing creation of services, we reduce dependencies and
 // keep the profile clean. Clients of this class must handle the NULL return
 // value, however.
 
 #ifndef CHROME_TEST_TESTING_BROWSER_PROCESS_H_
 #define CHROME_TEST_TESTING_BROWSER_PROCESS_H_
 #pragma once
 
 #include "build/build_config.h"
 
 #include <string>
 
 #include "base/scoped_ptr.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/common/notification_service.h"
 
 class IOThread;
 class GoogleURLTracker;
 class PrefService;
+class WatchDogThread;
 
 namespace base {
 class WaitableEvent;
 }
 
 namespace policy {
 class BrowserPolicyConnector;
 }
 
 namespace ui {
@@ skipping 16 matching lines @@
 #if defined(OS_LINUX)
   virtual base::Thread* background_x11_thread();
 #endif
 
   virtual base::Thread* file_thread();
 
   virtual base::Thread* db_thread();
 
   virtual base::Thread* cache_thread();
 
+  virtual WatchDogThread* watchdog_thread();
+
   virtual ProfileManager* profile_manager();
 
   virtual PrefService* local_state();
 
   virtual policy::BrowserPolicyConnector* browser_policy_connector();
 
   virtual IconManager* icon_manager();
 
   virtual ThumbnailGenerator* GetThumbnailGenerator();
 
@@ skipping 87 matching lines @@
 
  private:
   // TODO(phajdan.jr): Temporary, for http://crbug.com/61062.
   // After the transition is over, we should just stack-allocate it.
   scoped_ptr<TestingBrowserProcess> browser_process_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedTestingBrowserProcess);
 };
 
 #endif  // CHROME_TEST_TESTING_BROWSER_PROCESS_H_