[MD Extensions] Implement keyboard shortcuts page

chrome/browser/resources/md_extensions/keyboard_shortcuts.html

 <link rel="import" href="chrome://resources/html/cr.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable-behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-dropdown-menu/paper-dropdown-menu.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-item/paper-item.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-listbox/paper-listbox.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/color.html">
 <link rel="import" href="chrome://extensions/animation_helper.html">
-<link rel="import" href="chrome://extensions/shortcut_util.html">
+<link rel="import" href="chrome://extensions/shortcut_input.html">
 
 <dom-module id="extensions-keyboard-shortcuts">
   <template>
     <style>
       [hidden] {
         display: none !important;
       }
       .shortcut-card {
         background-color: white;
         box-shadow: 0 2px 2px 0 rgba(0, 0, 0, .05),
@@ skipping 31 matching lines @@
     </style>
     <div id="main">
       <template is="dom-repeat" items="[[calculateShownItems_(items.*)]]">
         <div class="shortcut-card">
           <div class="card-title">
             <img class="icon" src="[[item.iconUrl]]">
             <span>[[item.name]]</span>
           </div>
           <div class="card-controls">
             <template is="dom-repeat" items="[[item.commands]]" as="command">
-              <div class="command-entry">
+              <div class="command-entry" command="[[command]]">
                 <span class="command-name">[[command.description]]</span>
-                <span class="command-keys"
-                    hidden$="[[!hasKeybinding_(command.keybinding)]]">
-                  [[command.keybinding]]
-                </span>
-                <span class="no-command-set"
-                    hidden$="[[hasKeybinding_(command.keybinding)]]">
-                  $i18n{shortcutNotSet}
-                </span>
+                <extensions-shortcut-input item="[[item.id]]"
+                    shortcut="[[command.keybinding]]"
+                    command-name="[[command.name]]">
+                </extensions-shortcut-input>
                 <paper-dropdown-menu label="$i18n{shortcutScopeLabel}">
                   <paper-listbox class="dropdown-content"
                       selected="[[computeSelectedScope_(command)]]">
                     <paper-item>$i18n{shortcutScopeInChrome}</paper-item>
                     <paper-item>$i18n{shortcutScopeGlobal}</paper-item>
                   </paper-listbox>
                 </paper-dropdown>
               </div>
             </template>
           </div>
         </div>
       </template>
     </div>
   </template>
   <script src="chrome://extensions/keyboard_shortcuts.js"></script>
 </dom-module>