ChromeOS: implement per-user time zone preferences.

chrome/browser/chromeos/login/screens/network_screen.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/chromeos/login/screens/network_screen.h"
 
 #include <utility>
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/base/locale_util.h"
 #include "chrome/browser/chromeos/customization/customization_document.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
 #include "chrome/browser/chromeos/login/helper.h"
 #include "chrome/browser/chromeos/login/screen_manager.h"
 #include "chrome/browser/chromeos/login/screens/base_screen_delegate.h"
 #include "chrome/browser/chromeos/login/screens/network_view.h"
 #include "chrome/browser/chromeos/login/ui/input_events_blocker.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
 #include "chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos.h"
+#include "chrome/browser/chromeos/system/timezone_util.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/webui/chromeos/login/l10n_util.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
 #include "chromeos/network/network_handler.h"
 #include "chromeos/network/network_state_handler.h"
 #include "components/prefs/pref_service.h"
 #include "content/public/browser/browser_thread.h"
 #include "ui/base/l10n/l10n_util.h"
@@ skipping 92 matching lines @@
 
 std::string NetworkScreen::GetApplicationLocale() {
   return g_browser_process->GetApplicationLocale();
 }
 
 std::string NetworkScreen::GetInputMethod() const {
   return input_method_;
 }
 
 void NetworkScreen::SetTimezone(const std::string& timezone_id) {
-  std::string current_timezone_id;
-  CrosSettings::Get()->GetString(kSystemTimezone, &current_timezone_id);
-  if (current_timezone_id == timezone_id || timezone_id.empty())
+  if (timezone_id.empty())
     return;
+
   timezone_ = timezone_id;
-  CrosSettings::Get()->SetString(kSystemTimezone, timezone_id);
+  chromeos::system::SetSigninScreenTimezone(timezone_id,
+                                            true /* set_system_timezone */);
 }
 
 std::string NetworkScreen::GetTimezone() const {
   return timezone_;
 }
 
 void NetworkScreen::GetConnectedWifiNetwork(std::string* out_onc_spec) {
   // Currently We can only transfer unsecured WiFi configuration from shark to
   // remora. There is no way to get password for a secured Wifi network in Cros
   // for security reasons.
@@ skipping 291 matching lines @@
     observer.OnLanguageListReloaded();
 }
 
 void NetworkScreen::OnSystemTimezoneChanged() {
   std::string current_timezone_id;
   CrosSettings::Get()->GetString(kSystemTimezone, &current_timezone_id);
   GetContextEditor().SetString(kContextKeyTimezone, current_timezone_id);
 }
 
 }  // namespace chromeos