Update audio api to use v2 stable device ID

extensions/test/data/api_test/audio/add_nodes/background.js

 // Copyright 2015 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.
 
 chrome.test.runTests([
   function waitForDeviceChangedEventTests() {
     chrome.test.listenOnce(chrome.audio.OnDevicesChanged, function(devices) {
       var deviceList = devices.map(function(device) {
         return {
           id: device.id,
+          stableId: device.stableId,
           stableDeviceId: device.stableDeviceId,
           isInput: device.isInput,
           deviceType: device.deviceType,
           deviceName: device.deviceName,
           displayName: device.displayName
         };
       }).sort(function(lhs, rhs) {
         return Number.parseInt(lhs.id) - Number.parseInt(rhs.id);
       });
 
+     chrome.test.assertTrue(devices.length > 0);
+     var hasStableId = !!devices[0].stableId;
+
      chrome.test.assertEq([{
         id: '30001',
+        stableId: hasStableId ? '116606' /* 80001 ^ 0xFFFF */ : '',
         stableDeviceId: '80001',
         isInput: false,
         deviceType: 'USB',
         deviceName: 'Jabra Speaker',
         displayName: 'Jabra Speaker 1'
       }, {
         id: '30002',
+        stableId: hasStableId ? '116605' /* 80002 ^ 0xFFFF */ : '',
         stableDeviceId: '80002',
         isInput: false,
         deviceType: 'USB',
         deviceName: 'Jabra Speaker',
         displayName: 'Jabra Speaker 2'
       }, {
         id: '30003',
+        stableId: hasStableId ? '116604' /* 80003 ^ 0xFFFF */ : '',
         stableDeviceId: '80003',
         isInput: false,
         deviceType: 'HDMI',
         deviceName: 'HDMI output',
         displayName: 'HDA Intel MID'
       }], deviceList);
     });
   }
 ]);
 
 chrome.test.sendMessage('loaded');