Added background page loader component extension.

chrome/browser/resources/chromeos/backloader/web/cros_validator.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.
+
+function ChromeOSValidator() {
+}
+
+ChromeOSValidator.getInstance = function() {
+  if (!ChromeOSValidator.instance_) {
+    ChromeOSValidator.instance_ = new ChromeOSValidator();
+  }
+  return ChromeOSValidator.instance_;
+};
+
+ChromeOSValidator.prototype = {
+  LOADER_ORIGIN: 'chrome-extension://nbicjcbcmclhihdkigkjgkgafckdfcom',
+  LOADER_PAGE: '/background.html',
+  callback_: undefined,
+
+  validate: function(callback) {
+    this.callback_ = callback;
+    var msg = { method: 'validate' };
+    window.parent.postMessage(msg,
+        this.LOADER_ORIGIN + this.LOADER_PAGE);
+  },
+
+  initialize: function() {
+    window.addEventListener('message', this.onMessage.bind(this), false);
+  },
+
+  isValidMessage_: function(msg) {
+    return msg.origin == this.LOADER_ORIGIN;
+  },
+
+  onMessage: function(e) {
+    var msg = e.data;
+    if (msg.method == 'validationResults' && this.isValidMessage_(e)) {
+      if (this.callback_)
+        this.callback_(msg.os == 'ChromeOS');
+    } else {
+      console.log('#### ChromeOSValidator.onMessage: unknown message');
+      if (this.callback_)
+        this.callback_(false);
+    }
+  }
+};
+
+ChromeOSValidator.getInstance().initialize();