[Polymer] updating

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
      */
     var KEY_IDENTIFIER = {
@@ skipping 145 matching lines @@
       * Calculates the normalized key for a KeyboardEvent.
       * @param {KeyboardEvent} keyEvent
       * @param {Boolean} [noSpecialChars] Set to true to limit keyEvent.key
       * transformation to alpha-numeric chars. This is useful with key
       * combinations like shift + 2, which on FF for MacOS produces
       * keyEvent.key = @
       * To get 2 returned, set noSpecialChars = true
       * To get @ returned, set noSpecialChars = false
      */
     function normalizedKeyForEvent(keyEvent, noSpecialChars) {
-      // Fall back from .key, to .keyIdentifier, to .keyCode, and then to
-      // .detail.key to support artificial keyboard events.
-      return transformKey(keyEvent.key, noSpecialChars) ||
-        transformKeyIdentifier(keyEvent.keyIdentifier) ||
-        transformKeyCode(keyEvent.keyCode) ||
-        transformKey(keyEvent.detail ? keyEvent.detail.key : keyEvent.detail, noSpecialChars) || '';
+      // Fall back from .key, to .detail.key for artifical keyboard events,
+      // and then to deprecated .keyIdentifier and .keyCode.
+      if (keyEvent.key) {
+        return transformKey(keyEvent.key, noSpecialChars);
+      }
+      if (keyEvent.detail && keyEvent.detail.key) {
+        return transformKey(keyEvent.detail.key, noSpecialChars);
+      }
+      return transformKeyIdentifier(keyEvent.keyIdentifier) ||
+        transformKeyCode(keyEvent.keyCode) || '';
     }
 
     function keyComboMatchesEvent(keyCombo, event) {
       // For combos with modifiers we support only alpha-numeric keys
       var keyEvent = normalizedKeyForEvent(event, keyCombo.hasModifiers);
       return keyEvent === keyCombo.key &&
         (!keyCombo.hasModifiers || (
           !!event.shiftKey === !!keyCombo.shiftKey &&
           !!event.ctrlKey === !!keyCombo.ctrlKey &&
           !!event.altKey === !!keyCombo.altKey &&
@@ skipping 287 matching lines @@
           detail: detail,
           cancelable: true
         });
         this[handlerName].call(this, event);
         if (event.defaultPrevented) {
           keyboardEvent.preventDefault();
         }
       }
     };
   })();