Handle closing web contents in ExtensionOptionsGuest

chrome/test/data/extensions/webui/receives_extension_options_on_close.js

+// Copyright 2014 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.
+
+// out/Debug/browser_tests
+//     --gtest_filter=ExtensionWebUITest.ReceivesExtensionOptionsOnClose
+if (!chrome || !chrome.test || !chrome.test.sendMessage) {
+  console.error('chrome.test.sendMessage is unavailable on ' +
+                document.location.href);
+  domAutomationController.send(false);
+  return;
+}
+
+chrome.test.sendMessage('ready', function(reply) {
+  var extensionoptions = document.createElement('extensionoptions');
+  extensionoptions.onclose = function() {
+    chrome.test.sendMessage('onclose received');
+  };
+  extensionoptions.setAttribute('extension', reply);
+  document.body.appendChild(extensionoptions);
+});
+
+domAutomationController.send(true);