MD Settings: Fix search engines page popup menu.

chrome/browser/resources/settings/search_engines_page/search_engine_entry.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-search-engine-entry' is a component for showing a
  * search engine with its name, domain and query URL.
  */
+(function() {
+/**
+ * The max z index assigned to a <settings-search-engine-entry> so far. Used to
+ * ensure that the popup menu is displayed correctly.
+ * @type {number}
+ */
+var maxZIndex = 0;

[stevenjb, 2016/09/26 22:45:20]

Can this just be a member of the Polymer object instead?

+
 Polymer({
   is: 'settings-search-engine-entry',
 
   properties: {
     /** @type {!SearchEngine} */
     engine: Object,
 
     /** @private {boolean} */
     showEditSearchEngineDialog_: Boolean,
 
@@ skipping 42 matching lines @@
     }.bind(this));
   },
 
   /** @private */
   onMakeDefaultTap_: function() {
     this.closePopupMenu_();
     this.browserProxy_.setDefaultSearchEngine(this.engine.modelIndex);
   },
 
   /** @private */
+  onDotsTap_: function() {
+    this.style.zIndex = ++maxZIndex;
+  },
+
+  /** @private */
   closePopupMenu_: function() {
     this.$$('iron-dropdown').close();
   },
 
   /**
    * @param {?string} url The icon URL if available.
    * @return {string} A set of icon URLs.
    * @private
    */
   getIconSet_: function(url) {
     // Force default icon, if no |engine.iconURL| is available.
     return cr.icon.getFavicon(url || '');
   },
 });
+})();