ChromeOS: implement per-user time zone preferences.

chrome/browser/ui/webui/settings/chromeos/date_time_handler.cc

 // Copyright 2016 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/ui/webui/settings/chromeos/date_time_handler.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 71 matching lines @@
   html_source->AddString(
       "timeZoneID",
       system::TimezoneSettings::GetInstance()->GetCurrentTimezoneID());
 
   if (!IsTimezoneAutomaticDetectionUserEditable()) {
     html_source->AddBoolean("timeZoneAutoDetectValueFromPolicy",
                             g_browser_process->platform_part()
                                 ->GetTimezoneResolverManager()
                                 ->ShouldApplyResolvedTimezone());
   }
+  html_source->AddBoolean("perUserTimezoneEnabled",
+                          system::PerUserTimezoneEnabled());
 
   return new DateTimeHandler;
 }
 
 void DateTimeHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback(
       "dateTimePageReady", base::Bind(&DateTimeHandler::HandleDateTimePageReady,
                                       base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
       "getTimeZones",
@@ skipping 71 matching lines @@
   FireWebUIListener("time-zone-auto-detect-policy", base::Value(managed),
                     base::Value(force_enabled));
 }
 
 void DateTimeHandler::SystemClockCanSetTimeChanged(bool can_set_time) {
   FireWebUIListener("can-set-date-time-changed", base::Value(can_set_time));
 }
 
 }  // namespace settings
 }  // namespace chromeos