MD Settings: Display languages native display name.

chrome/browser/resources/settings/languages_page/add_languages_dialog.js

 // Copyright 2016 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.
 
 /**
  * @fileoverview 'settings-add-languages-dialog' is a dialog for enabling
  * languages.
  */
 Polymer({
   is: 'settings-add-languages-dialog',
@@ skipping 55 matching lines @@
 
       if (!this.filterValue_)
         return isAvailableLanguage;
 
       return language.displayName.toLowerCase().includes(
           this.filterValue_.toLowerCase());
     }.bind(this));
   },
 
   /**
+   * @param {!chrome.languageSettingsPrivate.Language} language
+   * @return {string} The text to be displayed.
+   * @private
+   */
+  getDisplayText_: function(language) {
+     var displayText = language.displayName;
+     // If the native name is different, add it.
+     if (language.displayName != language.nativeDisplayName)
+       displayText += ' - ' + language.nativeDisplayName;

[dpapad, 2017/03/27 22:46:29]

This is on par with the old Options, see
https://cs.chromium.org/chromium/src/chrome/browser/resources/options/languag....

+     return displayText;
+  },
+
+  /**
    * True if the user has chosen to add this language (checked its checkbox).
    * @param {string} languageCode
    * @return {boolean}
    * @private
    */
   willAdd_: function(languageCode) {
     return this.languagesToAdd_.has(languageCode);
   },
 
   /**
@@ skipping 25 matching lines @@
    * Enables the checked languages.
    * @private
    */
   onActionButtonTap_: function() {
     this.$.dialog.close();
     this.languagesToAdd_.forEach(function(languageCode) {
       this.languageHelper.enableLanguage(languageCode);
     }.bind(this));
   },
 });