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

chrome/browser/ui/webui/options/managed_user_passphrase_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_PASSPHRASE_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_OPTIONS_MANAGED_USER_PASSPHRASE_HANDLER_H_
+
+#include <string>
+
+#include "base/prefs/public/pref_change_registrar.h"
+#include "chrome/browser/ui/webui/options/options_ui.h"
+
+namespace base {
+class ListValue;
+}
+
+namespace options {
+
+class ManagedUserPassphraseHandler : public OptionsPageUIHandler {
+ public:
+  ManagedUserPassphraseHandler();
+  virtual ~ManagedUserPassphraseHandler();

[Bernhard Bauer, 2013/01/07 14:20:22]

Newline pls.

+  virtual void InitializeHandler() OVERRIDE;

[Bernhard Bauer, 2013/01/07 14:20:22]

Please add a comment stating which class you override. Hm, I guess it's
OptionsPageUIHandler? In that case, move this down so they're together.

+  virtual void RegisterMessages() OVERRIDE;
+
+  // OptionsPageUIHandler implementation.
+  virtual void GetLocalizedValues(
+      base::DictionaryValue* localized_strings) OVERRIDE;
+
+ private:
+  void DisplayPassphraseDialog(const base::ListValue* args);
+  void OnPreferenceChanged();
+  void SetLocalPassphrase(const base::ListValue* args);
+  void CorrectPassphraseEntered();

[Bernhard Bauer, 2013/01/07 14:20:22]

Moar newlinez!!!11!oneone

+  std::string callback_function_name_;
+  PrefChangeRegistrar registrar_;
+  DISALLOW_COPY_AND_ASSIGN(ManagedUserPassphraseHandler);
+};
+
+}  // namespace options
+
+#endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_MANAGED_USER_PASSPHRASE_HANDLER_H_