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) 2013 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/memory/weak_ptr.h"
@@ skipping 15 matching lines @@
   virtual void RegisterMessages() OVERRIDE;
   virtual void GetLocalizedValues(
       base::DictionaryValue* localized_strings) OVERRIDE;
 
  private:
   // This function is used to set the passphrase of the manager of the managed
   // account. The passphrase is expected as the parameter and is passed in from
   // the UI.
   void SetLocalPassphrase(const base::ListValue* args);
 
+  // This function displays the passphrase dialog where the manager of the

[Pam (message me for reviews), 2013/02/15 09:31:18]

Nit: For brevity, I would remove all the "This function" pieces, and just start
with (e.g.) "Displays the passphrase...". Also from SetLocalPassphrase, in that
case.

[Adrian Kuegel, 2013/02/15 09:56:02]

Done.

+  // managed account can enter the passphrase which allows him to modify the
+  // settings. It expects as parameter the name of the Javascript function
+  // which should be called after the passphrase has been checked.
+  void DisplayPassphraseDialog(const base::ListValue* args);
+
+  // This function will be called after the user either clicked Cancel or
+  // successfully entered the passphrase and clicked Unlock in the Passphrase
+  // Dialog.
+  void PassphraseDialogCallback(bool success);
+
+  // This function resets the authentication state of the manager of the
+  // managed account.
+  void EndAuthentication(const base::ListValue* args);
+
+  // This function checks if there is already a passphrase specified. It
+  // expects as parameter the name of the Javascript function which should be
+  // called with the results of this check.
+  void IsPassphraseSet(const base::ListValue* args);
+
+  // This function resets the passphrase to the empty string.
+  void ResetPassphrase(const base::ListValue* args);
+
+  // This variable is used to save the name of the Javascript function
+  // which should be called after the passphrase has been checked.
+  std::string callback_function_name_;
   base::WeakPtrFactory<ManagedUserPassphraseHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ManagedUserPassphraseHandler);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_MANAGED_USER_PASSPHRASE_HANDLER_H_