Roll Polymer

third_party/polymer/v1_0/components-chromium/paper-dropdown-menu/paper-dropdown-menu-light-extracted.js

 (function() {
       'use strict';
 
       Polymer({
         is: 'paper-dropdown-menu-light',
 
         behaviors: [
           Polymer.IronButtonState,
           Polymer.IronControlState,
           Polymer.PaperRippleBehavior,
@@ skipping 117 matching lines @@
         listeners: {
           'tap': '_onTap'
         },
 
         keyBindings: {
           'up down': 'open',
           'esc': 'close'
         },
 
         hostAttributes: {
+          tabindex: 0,
           role: 'combobox',
           'aria-autocomplete': 'none',
           'aria-haspopup': 'true'
         },
 
         observers: [
           '_selectedItemChanged(selectedItem)'
         ],
 
         attached: function() {
@@ skipping 123 matching lines @@
 
         _valueChanged: function() {
           // Only update if it's actually different.
           if (this.$.input && this.$.input.textContent !== this.value) {
             this.$.input.textContent = this.value;
           }
           this._setHasContent(!!this.value);
         },
       });
     })();