Mojoify time zone update IPC from browser to renderer

device/time_zone_monitor/public/interfaces/time_zone_monitor.mojom

Index: device/time_zone_monitor/public/interfaces/time_zone_monitor.mojom
diff --git a/device/time_zone_monitor/public/interfaces/time_zone_monitor.mojom b/device/time_zone_monitor/public/interfaces/time_zone_monitor.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..207b0a086a5e62caf98f9fea9810a2e0ec65cd8a
--- /dev/null
+++ b/device/time_zone_monitor/public/interfaces/time_zone_monitor.mojom
@@ -0,0 +1,17 @@
+// Copyright 2016 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.
+
+module device.mojom;
+
+interface TimeZoneMonitor {
+  // Add a client that will get notified on time zone changes. No throttling is
+  // employed, as time zone changes are infrequent enough that there is no
+  // realistic risk of flooding.
+  AddClient(TimeZoneMonitorClient client);

[jam, 2016/09/15 16:12:11]

nit: do we really need two interfaces? Why not just have just this one, i.e.

RegisterForTimeZoneChanges() => (string tz_info)

+};
+
+interface TimeZoneMonitorClient {
+  // Called on a time zone change. |tz_info| is the new time zone ID.
+  OnTimeZoneChange(string tz_info);
+};