diff -r 000000000000 -r 6474c204b198 dom/system/gonk/TimeZoneSettingObserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/system/gonk/TimeZoneSettingObserver.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_system_timesetting_h__
+#define mozilla_system_timesetting_h__
+
+namespace mozilla {
+namespace system {
+
+// Initialize TimeZoneSettingObserver which observes the time zone change
+// event from settings service. When receiving the event, it modifies the
+// system time zone.
+void InitializeTimeZoneSettingObserver();
+
+} // namespace system
+} // namespace mozilla
+
+#endif // mozilla_system_timesetting_h__
+