Add bluetooth callbacks for fetching paired devices and stopping device discovery.

chrome/browser/resources/options2/chromeos/bluetooth_add_device_overlay.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('options', function() {
   const OptionsPage = options.OptionsPage;
 
   /**
    * Encapsulated handling of the Bluetooth options page.
    * @constructor
@@ skipping 16 matching lines @@
      * @private
      */
     deviceList_: null,
 
     /** @inheritDoc */
     initializePage: function() {
       OptionsPage.prototype.initializePage.call(this);
       this.createDeviceList_();
 
       $('bluetooth-add-device-cancel-button').onclick = function(event) {
+        chrome.send('stopBluetoothDeviceDiscovery');
         OptionsPage.closeOverlay();
       };
 
       var self = this;
       $('bluetooth-add-device-apply-button').onclick = function(event) {
         var device = self.deviceList_.selectedItem;
         var address = device.address;
+        chrome.send('stopBluetoothDeviceDiscovery');
         chrome.send('updateBluetoothDevice', [address, 'connect']);
         OptionsPage.closeOverlay();
       };
 
       $('bluetooth-add-device-apply-button').onmousedown = function(event) {
         // Prevent 'blur' event, which would reset the list selection,
         // thereby disabling the apply button.
         event.preventDefault();
       };
 
@@ skipping 14 matching lines @@
       options.system.bluetooth.BluetoothDeviceList.decorate(this.deviceList_);
       this.deviceList_.autoExpands = true;
     }
   };
 
   // Export
   return {
     BluetoothOptions: BluetoothOptions
   };
 });