Implement <extensionoptions> deferred attach logic

chrome/test/data/extensions/api_test/extension_options/embed_self/test.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.
 
 function optionsPageLoaded() {
   var hasLoaded = false;
   chrome.extension.getViews().forEach(function(view) {
     if (view.document.location.pathname == '/options.html') {
       chrome.test.assertEq(false, hasLoaded);
       hasLoaded = view.loaded;
@@ skipping 29 matching lines @@
         chrome.test.assertTrue(optionsPageLoaded());
         chrome.test.succeed();
       } finally {
         document.body.removeChild(extensionoptions);
       }
     };
     extensionoptions.extension = chrome.runtime.id;
     document.body.appendChild(extensionoptions);
   },
 
+  function createGuestViewDeferredAttach() {
+    var extensionoptions = new ExtensionOptions();
+    extensionoptions.onload = function() {
+      try {
+        chrome.test.assertTrue(optionsPageLoaded());
+        chrome.test.succeed();
+      } finally {
+        document.body.removeChild(extensionoptions);
+      }
+    };
+    extensionoptions.extension = chrome.runtime.id;
+    setTimeout(function() {
+      document.body.appendChild(extensionoptions);
+    }, 1000);

[not at google - send to devlin, 2014/08/12 19:58:29]

Why 1000? Just make it 0, no need to make this test run 1s longer than it needs
to.

[ericzeng, 2014/08/12 21:53:33]

Unfortunately I need a small delay in order to reproduce the bug. If appendChild
is run immediately after the extension id is set it looks like the browser
plugin can be initialized in time for extensionoptions to call attach. I can
shorten it but the delay needs to be there to prevent the race from occurring.

+  },
+
   // Tests if the <extensionoptions> guest view is successfully created and can
   // communicate with the embedder. This test expects that the guest options
   // page will add a {'pass': true} property to every Window and fire the
   // runtime.onMessage event with a short message.
   function canCommunicateWithGuest() {
     var done = chrome.test.listenForever(chrome.runtime.onMessage,
         function(message, sender, sendResponse) {
       if (message == 'ready') {
         sendResponse('canCommunicateWithGuest');
       } else if (message == 'done') {
@@ skipping 71 matching lines @@
         chrome.test.assertTrue(evt.height <= 501);
         done();
       } finally {
         document.body.removeChild(extensionoptions);
       }
     };
 
     document.body.appendChild(extensionoptions);
   }
 ]);