Desktop Capture API: Pass Audio Selection Information To Javascript

chrome/renderer/resources/extensions/desktop_capture_custom_bindings.js

 // Copyright 2013 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.
 
 // Custom binding for the desktopCapture API.
 
 var binding = require('binding').Binding.create('desktopCapture');
 var sendRequest = require('sendRequest').sendRequest;
 var idGenerator = requireNative('id_generator');
 
 binding.registerCustomHook(function(bindingsAPI) {
   var apiFunctions = bindingsAPI.apiFunctions;
 
   var pendingRequests = {};
 
-  function onRequestResult(id, result) {
+  function onRequestResult(id, result, options) {
     if (id in pendingRequests) {
       var callback = pendingRequests[id];
       delete pendingRequests[id];
-      callback(result);
+      callback(result, options);
     }
   }
 
   apiFunctions.setHandleRequest('chooseDesktopMedia',
                                 function(sources, target_tab, callback) {
     // |target_tab| is an optional parameter.
     if (callback === undefined) {
       callback = target_tab;
       target_tab = undefined;
     }
     var id = idGenerator.GetNextId();
     pendingRequests[id] = callback;
     sendRequest(this.name,
                 [id, sources, target_tab, onRequestResult.bind(null, id)],
                 this.definition.parameters);
     return id;
   });
 
   apiFunctions.setHandleRequest('cancelChooseDesktopMedia', function(id) {
     if (id in pendingRequests) {
       delete pendingRequests[id];
       sendRequest(this.name, [id], this.definition.parameters);
     }
   });
 });
 
 exports.$set('binding', binding.generate());