[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/iron-a11y-keys-behavior/demo/x-key-aware.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 
 <link rel="import" href="../../polymer/polymer.html">
-<link rel="import" href="../../paper-styles/paper-styles.html">
+<link rel="import" href="../../paper-styles/color.html">
 <link rel="import" href="../iron-a11y-keys-behavior.html">
 
 <dom-module id="x-key-aware">
   <style>
     :host {
       display: block;
       position: relative;
     }
 
     pre {
       color: var(--google-blue-700);
     }
-    
+
     .keys {
       line-height: 25px;
     }
 
     .keys span {
       cursor: default;
       background-color: var(--google-grey-100);
       border: 1px solid var(--google-grey-300);
       padding: 1px 5px;
       border-radius: 5px;
     }
   </style>
   <template>
     <h4>Press any of these keys</h4>
+    <input type="checkbox" checked="{{preventDefault::change}}"> prevent default = {{preventDefault}}
     <p class="keys">
       <template is="dom-repeat" items="[[boundKeys]]">
         <span>{{item}}</span>
       </template>
     </p>
     <pre>[[pressed]]</pre>
   </template>
 </dom-module>
 
 <script>
@@ skipping 11 matching lines @@
         value: ''
       },
 
       boundKeys: {
         type: Array,
         value: function() {
           return Object.keys(this.keyBindings).join(' ').split(' ');
         }
       },
 
+      preventDefault: {
+        type: Boolean,
+        value: true,
+        notify: true
+      },
+
       keyEventTarget: {
         type: Object,
         value: function() {
           return document.body;
         }
       }
     },
 
     keyBindings: {
-      '* pageup pagedown left right down up shift+a alt+a home end space enter': '_updatePressed'
+      '* pageup pagedown left right down up home end space enter @ ~ " $ ? ! \\ + : # backspace': '_updatePressed',
+      'a': '_updatePressed',
+      'shift+a alt+a': '_updatePressed',
+      'shift+tab shift+space': '_updatePressed'
     },
 
     _updatePressed: function(event) {
       console.log(event.detail);
 
+      if (this.preventDefault) {
+        event.preventDefault();
+      }
       this._setPressed(
         this.pressed + event.detail.combo + ' pressed!\n'
       );
     }
   });
 </script>