Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components-chromium/iron-a11y-keys-behavior/iron-a11y-keys-behavior-extracted.js

 
   (function() {
     'use strict';
 
     /**
      * Chrome uses an older version of DOM Level 3 Keyboard Events
      *
      * Most keys are labeled as text, but some are Unicode codepoints.
      * Values taken from: http://www.w3.org/TR/2007/WD-DOM-Level-3-Events-20071221/keyset.html#KeySet-Set
      */
@@ skipping 64 matching lines @@
       46: 'del',
       106: '*'
     };
 
     /**
      * MODIFIER_KEYS maps the short name for modifier keys used in a key
      * combo string to the property name that references those same keys
      * in a KeyboardEvent instance.
      */
     var MODIFIER_KEYS = {
-      shift: 'shiftKey',
-      ctrl: 'ctrlKey',
-      alt: 'altKey',
-      meta: 'metaKey'
+      'shift': 'shiftKey',
+      'ctrl': 'ctrlKey',
+      'alt': 'altKey',
+      'meta': 'metaKey'
     };
 
     /**
      * KeyboardEvent.key is mostly represented by printable character made by
      * the keyboard, with unprintable keys labeled nicely.
      *
      * However, on OS X, Alt+char can make a Unicode character that follows an
      * Apple-specific mapping. In this case, we
      * fall back to .keyCode.
      */
@@ skipping 300 matching lines @@
       _triggerKeyHandler: function(keyCombo, handlerName, keyboardEvent) {
         var detail = Object.create(keyCombo);
         detail.keyboardEvent = keyboardEvent;
 
         this[handlerName].call(this, new CustomEvent(keyCombo.event, {
           detail: detail
         }));
       }
     };
   })();