Add two instrumentation tests for Web Notifications on Android.

chrome/test/data/notifications/android_test_worker.js

Index: chrome/test/data/notifications/android_test_worker.js
diff --git a/chrome/test/data/extensions/platform_apps/extension_view/test.js b/chrome/test/data/notifications/android_test_worker.js
similarity index 55%
copy from chrome/test/data/extensions/platform_apps/extension_view/test.js
copy to chrome/test/data/notifications/android_test_worker.js
index d01f8765f7e8d69587d37944c57e58a77905a64f..421494a6e3dfb14beca28c2ecfc25fba715930b8 100644
--- a/chrome/test/data/extensions/platform_apps/extension_view/test.js
+++ b/chrome/test/data/notifications/android_test_worker.js
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-chrome.app.runtime.onLaunched.addListener(function() {
-  chrome.app.window.create('main.html', {}, function () {});
+var messagePort = null;
+
+addEventListener('message', function(event) {
+  messagePort = event.data;
+  messagePort.postMessage('ready');
 });