ChromeOS: Implement periodic timezone refresh on geolocation data.

chrome/browser/chromeos/system/timezone_util.h

 // Copyright 2013 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_SYSTEM_TIMEZONE_UTIL_H_
 #define CHROME_BROWSER_CHROMEOS_SYSTEM_TIMEZONE_UTIL_H_
 
 #include "base/memory/scoped_ptr.h"
 
 namespace base {
 class ListValue;
 }
 
 namespace chromeos {
+
+struct TimeZoneResponseData;
+
 namespace system {
 
 // Creates a list of pairs of each timezone's ID and name.
 scoped_ptr<base::ListValue> GetTimezoneList();
 
+// Returns true if device is managed and has SystemTimezonePolicy set.
+bool HasSystemTimezonePolicy();
+
+// Apply TimeZone update from TimeZoneProvider.
+void ApplyTimeZone(const TimeZoneResponseData* timezone);
+
 }  // namespace system
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_TIMEZONE_UTIL_H_