Add tests for ShellWindowLinkDelegate::OpenURLFromTab

chrome/test/data/extensions/platform_apps/external_open_link/main.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.
+
+chrome.test.runTests([
+  function openExternalLink() {
+    var linkNode = document.getElementById('test-link');
+    linkNode.onclick = function() {
+      chrome.test.succeed();
+    }
+    linkNode.href = 'http://www.google.com';
+
+    var clickEvent = document.createEvent('MouseEvents');
+    clickEvent.initMouseEvent('click', true, true, window,
+                              0, 0, 0, 0, 0, false, false,
+                              false, false, 0, null);
+    linkNode.dispatchEvent(clickEvent);
+  }
+]);