Show native language names in the add language overlay.

chrome/browser/resources/options/chromeos_language_add_language_overlay.js

 // Copyright (c) 2010 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.
 
 ///////////////////////////////////////////////////////////////////////////////
 // AddLanguageOverlay class:
 
 cr.define('options.language', function() {
 
   const OptionsPage = options.OptionsPage;
@@ skipping 29 matching lines @@
 
       // Create the language list with which users can add a language.
       // Note that we have about 40 languages.
       var addLanguageList = $('add-language-overlay-language-list');
       var languageListData = templateData.languageList;
       for (var i = 0; i < languageListData.length; i++) {
         var language = languageListData[i];
         var button = document.createElement('button');
         button.className = 'link-button';
         button.textContent = language.displayName;
+        // If the native name is different, add it.
+        if (language.displayName != language.nativeDisplayName) {
+          button.textContent += ' - ' + language.nativeDisplayName;
+        }
         button.languageCode = language.code;
         // Listen to user clicks.
         button.addEventListener('click',
                                 cr.bind(this.handleLanguageClick_, this));
         var li = document.createElement('li');
         li.languageCode = language.code;
         li.appendChild(button);
         addLanguageList.appendChild(li);
       }
     },
   };
 
   return {
     AddLanguageOverlay: AddLanguageOverlay
   };
 });