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

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

Index: chrome/browser/ui/webui/options/managed_user_settings_handler.h
diff --git a/chrome/browser/ui/webui/options/managed_user_settings_handler.h b/chrome/browser/ui/webui/options/managed_user_settings_handler.h
index 234ab1f4e2301d376f240de90da32836f3adc9b4..dd104baaf816edbaa252891a457ccde793edcc50 100644
--- a/chrome/browser/ui/webui/options/managed_user_settings_handler.h
+++ b/chrome/browser/ui/webui/options/managed_user_settings_handler.h
@@ -5,6 +5,7 @@
 #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_member.h"
 #include "base/time.h"
 #include "base/values.h"
 #include "chrome/browser/ui/webui/options/options_ui.h"
@@ -20,6 +21,7 @@ class ManagedUserSettingsHandler : public OptionsPageUIHandler {
   virtual void GetLocalizedValues(
       base::DictionaryValue* localized_strings) OVERRIDE;
 
+  virtual void InitializeHandler() OVERRIDE;
   virtual void InitializePage() OVERRIDE;
   virtual void RegisterMessages() OVERRIDE;
 
@@ -27,9 +29,14 @@ class ManagedUserSettingsHandler : public OptionsPageUIHandler {
   // 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_;
 
+  StringPrefMember passphrase_;

[Bernhard Bauer, 2013/02/20 13:06:20]

You don't actually need a PrefMember here. Just use a PrefChangeRegistrar and
fetch the pref value from the PrefService when needed.

[Adrian Kuegel, 2013/02/20 13:28:26]

Done.

+
   DISALLOW_COPY_AND_ASSIGN(ManagedUserSettingsHandler);
 };