Add Settings bluetooth page test

chrome/browser/resources/settings/bluetooth_page/bluetooth_page.html

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/device-icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-selector/iron-selector.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_collapse/cr_collapse.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://md-settings/settings_page/settings_animated_pages.html">
 
 <dom-module id="settings-bluetooth-page">
   <link rel="import" type="css" href="chrome://md-settings/settings_shared.css">
   <link rel="import" type="css" href="bluetooth_page.css">
   <template>
     <settings-animated-pages id="pages" current-route="{{currentRoute}}"
         section="bluetooth">
       <neon-animatable id="main">
         <div class="layout vertical">
           <div class="layout horizontal center">
             <iron-icon icon="device:bluetooth"></iron-icon>
             <span class="flex" i18n-content="bluetoothEnable"></span>
-            <paper-toggle-button checked="{{bluetoothEnabled}}"
+            <paper-toggle-button id="enableBluetooth"
+                checked="{{bluetoothEnabled}}"
                 on-change="onBluetoothEnabledChange_">
             </paper-toggle-button>
           </div>
           <cr-collapse opened="[[bluetoothEnabled]]">
             <div id="deviceList" class="layout vertical flex">
-              <span hidden$="[[haveDevices_(deviceList)]]"
+              <span hidden$="[[haveDevices_(deviceList.splices)]]"
                   i18n-content="bluetoothNoDevices">
               </span>
               <iron-selector selected="{{selectedDevice}}">
                 <template is="dom-repeat" items="[[deviceList]]">
                   <div class="device layout horizontal center"
                       hidden$="[[!showDeviceInList_(item)]]">
                     <span class="name flex"
                         connected$=[[item.connected]]
                         connecting$=[[item.connecting]]>
                       [[getDeviceText_(item)]]
@@ skipping 16 matching lines @@
             <paper-button id="addDevice" i18n-content="bluetoothAddDevice"
                 on-tap="onAddDeviceTap_">
             </paper-button>
           </div>
         </div>
       </neon-animatable>
     </settings-animated-pages>
   </template>
   <script src="bluetooth_page.js"></script>
 </dom-module>