MD Settings: Date and Time page, part 2/3

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

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_SETTINGS_CHROMEOS_DATE_TIME_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_CHROMEOS_DATE_TIME_HANDLER_H_
 
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
+#include "components/prefs/pref_change_registrar.h"
+
+namespace base {
+class ListValue;
+}
 
 namespace content {
 class WebUIDataSource;
 }
 
 namespace chromeos {
 namespace settings {
 
 // Chrome OS date and time settings page UI handler.
 class DateTimeHandler : public ::settings::SettingsPageUIHandler {
  public:
   ~DateTimeHandler() override;
 
   // Adds load-time values to html_source before creating the handler.
   static DateTimeHandler* Create(content::WebUIDataSource* html_source);
 
   // SettingsPageUIHandler implementation.
   void RegisterMessages() override;
   void OnJavascriptAllowed() override;
   void OnJavascriptDisallowed() override;
 
  private:
   DateTimeHandler();
 
+  // Called when the page is ready.
+  void HandleDateTimePageReady(const base::ListValue* args);
+
+  // Handler to fetch the list of time zones.
+  void HandleGetTimeZones(const base::ListValue* args);
+
+  // Updates the UI, enabling or disabling the time zone automatic detection
+  // setting according to policy.
+  void NotifyTimezoneAutomaticDetectionPolicy();
+
+  std::unique_ptr<chromeos::CrosSettings::ObserverSubscription>
+      system_timezone_policy_subscription_;
+
+  // Used to listen to changes to the system time zone detection policy.
+  PrefChangeRegistrar local_state_pref_change_registrar_;
+
+  base::WeakPtrFactory<DateTimeHandler> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(DateTimeHandler);
 };
 
 }  // namespace settings
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_CHROMEOS_DATE_TIME_HANDLER_H_