ChromeOS: Implement periodic timezone refresh on geolocation data.

chrome/browser/chromeos/system/timezone_util.h

Index: chrome/browser/chromeos/system/timezone_util.h
diff --git a/chrome/browser/chromeos/system/timezone_util.h b/chrome/browser/chromeos/system/timezone_util.h
index f2f97d4a6c54a5df054ff8ebbafe21753cfc9e67..484ba820a943b8fe562522b0818c4327d844d327 100644
--- a/chrome/browser/chromeos/system/timezone_util.h
+++ b/chrome/browser/chromeos/system/timezone_util.h
@@ -12,11 +12,20 @@ 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