ChromeOS: implement per-user time zone preferences.

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 6ebb3ea2912a6189672500d07426fa9894e0d524..a3ae098c675250ba06a62eb4b04bb020ee3c881d 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2998,7 +2998,10 @@ const FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kDisableNewVirtualKeyboardBehaviorName,
      flag_descriptions::kDisableNewVirtualKeyboardBehaviorDescription, kOsCrOS,
      SINGLE_DISABLE_VALUE_TYPE(switches::kDisableNewVirtualKeyboardBehavior)},
-#endif  // defined(OS_CHROMEOS)
+    {"enable-per-user-timezone", flag_descriptions::kEnablePerUserTimezoneName,
+     flag_descriptions::kEnablePerUserTimezoneDescription, kOsCrOS,
+     SINGLE_DISABLE_VALUE_TYPE(chromeos::switches::kDisablePerUserTimezone)},
+#endif  // OS_CHROMEOS
 
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms/enums.xml. See note in