ChromeOS: Implement periodic timezone refresh on geolocation data.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 096cdc0dfc4780576f44130e03315d07c40c1eb9..58540a261488995d08b31947724064138a0b72d6 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2096,6 +2096,16 @@ const Experiment kExperiments[] = {
     kOsAll,
     MULTI_VALUE_TYPE(kFillOnAccountSelectChoices)
   },
+#if defined(OS_CHROMEOS)
+  {
+    "enable-timezone-tracking",
+    IDS_FLAGS_ENABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_NAME,
+    IDS_FLAGS_ENABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION,
+    kOsCrOS,
+    SINGLE_VALUE_TYPE(chromeos::switches::kEnableTimeZoneTrackingOption)
+  },
+#endif  // defined(OS_CHROMEOS)
+
 
   // NOTE: Adding new command-line switches requires adding corresponding
   // entries to enum "LoginCustomFlags" in histograms.xml. See note in