MD Settings: Checks the event target in the language tap event handler

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

 // Copyright 2015 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-languages-page' is the settings page
  * for language and input method settings.
  */
 (function() {
 'use strict';
@@ skipping 38 matching lines @@
   },
 
   /** @override */
   created: function() {
     this.languageHelper_ = LanguageHelperImpl.getInstance();
   },
 
   /**
    * Handler for clicking a language on the main page, which selects the
    * language as the prospective UI language on Chrome OS and Windows.
-   * @param {!{model: !{item: !LanguageState}}} e
+   * @param {!Event} e The tap event.
    */
   onLanguageTap_: function(e) {
     // Only change the UI language on platforms that allow it.
     if ((!cr.isChromeOS && !cr.isWindows) || loadTimeData.getBoolean('isGuest'))
       return;
 
     // Set the prospective UI language. This won't take effect until a restart.
-    if (e.model.item.language.supportsUI)
-      this.languageHelper_.setUILanguage(e.model.item.language.code);
+    var tapEvent = /** @type {!{model: !{item: !LanguageState}}} */(e);
+    if (tapEvent.model.item.language.supportsUI)
+      this.languageHelper_.setUILanguage(tapEvent.model.item.language.code);
   },
 
   /**
+   * Stops tap events on the language options menu, its trigger, or its items
+   * from bubbling up to the language itself. Tap events on the language are
+   * handled in onLanguageTap_.
+   * @param {!Event} e The tap event.
+   */
+  stopPropagationHandler_: function(e) {
+    e.stopPropagation();
+  },
+
+  /**
    * Handler for enabling or disabling spell check.
    * @param {!{target: Element, model: !{item: !LanguageState}}} e
    */
   onSpellCheckChange_: function(e) {
     this.languageHelper_.toggleSpellCheck(e.model.item.language.code,
                                           e.target.checked);
   },
 
   /** @private */
   onBackTap_: function() {
@@ skipping 237 matching lines @@
    * HACK(michaelpg): This is necessary to show the list when navigating to
    * the sub-page. Remove this function when PolymerElements/neon-animation#60
    * is fixed.
    * @param {string} tagName Name of the element containing the <iron-list>.
    */
   forceRenderList_: function(tagName) {
     this.$$(tagName).$$('iron-list').fire('iron-resize');
   },
 });
 })();