ChromeOS: implement per-user time zone preferences.

chrome/browser/chromeos/login/wizard_controller.cc

Index: chrome/browser/chromeos/login/wizard_controller.cc
diff --git a/chrome/browser/chromeos/login/wizard_controller.cc b/chrome/browser/chromeos/login/wizard_controller.cc
index 84a770db3f4eaa288b1cf94418e4f0c1ddd248f3..5d50c2fc636c611e2b12da167dce5b9da2136b3b 100644
--- a/chrome/browser/chromeos/login/wizard_controller.cc
+++ b/chrome/browser/chromeos/login/wizard_controller.cc
@@ -1427,9 +1427,9 @@ void WizardController::OnTimezoneResolved(
   if (!timezone->timeZoneId.empty()) {
     VLOG(1) << "Resolve TimeZone: setting timezone to '" << timezone->timeZoneId
             << "'";
-
-    system::TimezoneSettings::GetInstance()->SetTimezoneFromID(
-        base::UTF8ToUTF16(timezone->timeZoneId));
+    g_browser_process->local_state()->SetString(prefs::kSigninScreenTimezone,
+                                                timezone->timeZoneId);
+    CrosSettings::Get()->SetString(kSystemTimezone, timezone->timeZoneId);

[stevenjb, 2017/05/15 17:08:02]

Setting both of these in multiple places is a little confusing, maybe have a
helper function somewhere instead, maybe in timezone_util?

[Alexander Alekseev, 2017/05/16 01:11:56]

Done.

   }
 }