Implement ephemeral users

chrome/browser/resources/options/personal_options.js

 // 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.
 
 cr.define('options', function() {
 
   var OptionsPage = options.OptionsPage;
   var ArrayDataModel = cr.ui.ArrayDataModel;
 
   /**
@@ skipping 104 matching lines @@
       } else {
         $('change-picture-button').onclick = function(event) {
           OptionsPage.navigateToPage('changePicture');
         };
         this.updateAccountPicture_();
 
         if (cr.commandLine && cr.commandLine.options['--bwsi']) {
           // Disable the screen lock checkbox and change-picture-button in
           // guest mode.
           $('enable-screen-lock').disabled = true;
           $('change-picture-button').disabled = true;

[Nikita (slow), 2012/03/07 10:03:04]

Same here, please enable back. We should not disable functionality. Users may
want to test all features of Chrome OS. 

Changing picture is one of them. Code in UserManager makes sure images wouldn't
be saved to LocalState/disk but they'll be in memory.

[use bartfab instead, 2012/03/07 11:10:08]

Done.

+        } else if (localStrings.getString('current_user_is_ephemeral') ==
+            'true') {
+          // Disable the change-picture-button for ephemeral users.
+          $('change-picture-button').disabled = true;
         }
       }
 
       if (PersonalOptions.disablePasswordManagement()) {
         // Disable the Password Manager in guest mode.
         $('passwords-offersave').disabled = true;
         $('passwords-neversave').disabled = true;
         $('passwords-offersave').value = false;
         $('passwords-neversave').value = true;
         $('manage-passwords').disabled = true;
@@ skipping 228 matching lines @@
       return instance[name + '_'].apply(instance, arguments);
     };
   });
 
   // Export
   return {
     PersonalOptions: PersonalOptions
   };
 
 });