ChromeOS: Implement periodic timezone refresh on geolocation data.

chrome/browser/chromeos/preferences.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_CHROMEOS_PREFERENCES_H_
 #define CHROME_BROWSER_CHROMEOS_PREFERENCES_H_
 
 #include <string>
 
 #include "ash/shell_observer.h"
 #include "base/compiler_specific.h"
+#include "base/prefs/pref_change_registrar.h"
 #include "base/prefs/pref_member.h"
 #include "chrome/browser/chromeos/language_preferences.h"
 #include "chrome/browser/prefs/pref_service_syncable_observer.h"
 #include "components/user_manager/user_manager.h"
 #include "ui/base/ime/chromeos/input_method_manager.h"
 
 class PrefRegistrySimple;
 class PrefService;
 class PrefServiceSyncable;
 
@@ skipping 112 matching lines @@
   StringPrefMember current_input_method_;
   StringPrefMember previous_input_method_;
   StringPrefMember enabled_extension_imes_;
 
   BooleanPrefMember xkb_auto_repeat_enabled_;
   IntegerPrefMember xkb_auto_repeat_delay_pref_;
   IntegerPrefMember xkb_auto_repeat_interval_pref_;
 
   BooleanPrefMember wake_on_wifi_ssid_;
 
+  PrefChangeRegistrar pref_change_registrar_;
+
   // User owning these preferences.
   const user_manager::User* user_;
 
   // Whether user is a primary user.
   bool user_is_primary_;
 
   // Input Methods state for this user.
   scoped_refptr<input_method::InputMethodManager::State> ime_state_;
 
   scoped_ptr<input_method::InputMethodSyncer> input_method_syncer_;
 
   DISALLOW_COPY_AND_ASSIGN(Preferences);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PREFERENCES_H_