Add a lock to the managed user settings page and require authentication for unlocking.

chrome/browser/ui/webui/options/managed_user_settings_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_OPTIONS_MANAGED_USER_SETTINGS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_MANAGED_USER_SETTINGS_HANDLER_H_
 
+#include "base/prefs/public/pref_change_registrar.h"
 #include "base/time.h"
 #include "base/values.h"
 #include "chrome/browser/ui/webui/options/options_ui.h"
 
 namespace options {
 
 class ManagedUserSettingsHandler : public OptionsPageUIHandler {
  public:
   ManagedUserSettingsHandler();
   virtual ~ManagedUserSettingsHandler();
 
   // OptionsPageUIHandler implementation.
   virtual void GetLocalizedValues(
       base::DictionaryValue* localized_strings) OVERRIDE;
 
+  virtual void InitializeHandler() OVERRIDE;
   virtual void InitializePage() OVERRIDE;
   virtual void RegisterMessages() OVERRIDE;
 
  private:
   // Save user metrics. Called from WebUI.
   void SaveMetrics(const base::ListValue* args);
 
+  // Called when the local passphrase changes.
+  void OnLocalPassphraseChanged();
+
   // For tracking how long the user spends on this page.
   base::TimeTicks start_time_;
 
+  PrefChangeRegistrar pref_change_registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(ManagedUserSettingsHandler);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_MANAGED_USER_SETTINGS_HANDLER_H_