Adjust the profile sync service to properly set per user or per machine flags.

chrome/browser/sync/profile_sync_service.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.
 
 #ifndef CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #define CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 
 #include <list>
 #include <string>
 #include <utility>
@@ skipping 772 matching lines @@
   // |invalidator_registrar_| is not NULL).
   void UpdateInvalidatorRegistrarState();
 
   // Destroys / recreates an instance of ProfileSyncService. Used exclusively by
   // the sync integration tests so they can restart sync from scratch without
   // tearing down and recreating the browser process. Needed because simply
   // calling Shutdown() and Initialize() will not recreate other internal
   // objects like SyncBackendHost, SyncManager, etc.
   void ResetForTest();
 
+  // Sets a flag for enabling an experiment.
+  void SetExperimentFlag(const std::string& experiment);
+
   // Factory used to create various dependent objects.
   scoped_ptr<ProfileSyncComponentsFactory> factory_;
 
   // The profile whose data we are synchronizing.
   Profile* profile_;
 
   // The class that handles getting, setting, and persisting sync
   // preferences.
   browser_sync::SyncPrefs sync_prefs_;
 
@@ skipping 125 matching lines @@
   syncer::WeakHandle<syncer::DataTypeDebugInfoListener> debug_info_listener_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const syncer::SyncProtocolError& error);
 
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_