ChromeOS: Implement periodic timezone refresh on geolocation data.

chromeos/chromeos_switches.cc

Index: chromeos/chromeos_switches.cc
diff --git a/chromeos/chromeos_switches.cc b/chromeos/chromeos_switches.cc
index ff0dc0a3103ce12fed37e03c013f503b7180c1b5..2fea1cd7b11a19fe7408ad4b44ffe58be671aa69 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -284,6 +284,9 @@ const char kArtifactsDir[] = "artifacts-dir";
 const char kEnableCaptivePortalBypassProxy[] =
     "enable-captive-portal-bypass-proxy";
 
+// Enable automatic timezone update.
+const char kEnableTimeZoneTrackingOption[] = "enable-timezone-tracking-option";
+
 bool WakeOnWifiEnabled() {
   return !base::CommandLine::ForCurrentProcess()->HasSwitch(kDisableWakeOnWifi);
 }