Make 'options' and callback arg to chrome.appWindow.create optional.

chrome/renderer/resources/extensions/app_window_custom_bindings.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.
 
 // Custom bindings for the app_window API.
 
 var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 var sendRequest = require('sendRequest').sendRequest;
 var appWindowNatives = requireNative('app_window');
+var GetView = appWindowNatives.GetView;
 
-chromeHidden.registerCustomHook('appWindow', function() {
-  var internal_appWindow_create = chrome.appWindow.create;
-  chrome.appWindow.create = function(url, opts, cb) {
-    internal_appWindow_create(url, opts, function(view_id) {
-      var dom = appWindowNatives.GetView(view_id);
-      cb(dom);
-    });
-  };
+chromeHidden.registerCustomHook('appWindow', function(bindingsAPI) {
+  var apiFunctions = bindingsAPI.apiFunctions;
+  apiFunctions.setCustomCallback('create', function (name, request, response) {
+    var dom = null;
+    if (response)
+      dom = GetView(response);
+    if (request.callback)
+      request.callback(dom);
+    request.callback = null;

[not at google - send to devlin, 2012/05/28 04:46:43]

nits: no space in "function (", rename variable "response" to "view_id" and
"dom" to "view", put the "request.callback = null" inside the "if
(request.callback)".  Consider using "delete" instead of = null.

[jeremya, 2012/05/28 06:49:01]

Done. Why delete instead of = null?

[not at google - send to devlin, 2012/05/28 06:52:55]

Personal preference, I think it's neater in this context, but it's effectively
the same (that or the more typical = undefined). Don't feel strongly at all
though.

[jeremya, 2012/05/28 07:06:45]

. o O ( I wonder if one is more or less optimal for v8 than the other. Does
`delete` cause it to repack data? Obviously irrelevant here, but interesting :)
)

[not at google - send to devlin, 2012/05/28 08:05:54]

Probably not worth thinking about too much :)

+  })
 });