Added webdriver support for App v2.

chrome/test/webdriver/test/app_shell_extension/bg.js

Index: chrome/test/webdriver/test/app_shell_extension/bg.js
diff --git a/chrome/test/webdriver/test/app_shell_extension/bg.js b/chrome/test/webdriver/test/app_shell_extension/bg.js
new file mode 100644
index 0000000000000000000000000000000000000000..aaeae4447fa4759b3ced774e444d99bf5190e6e1
--- /dev/null
+++ b/chrome/test/webdriver/test/app_shell_extension/bg.js
@@ -0,0 +1,13 @@
+// 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.experimental.app.onLaunched.addListener(function(data) {
+  chrome.app.window.create('view_checks.html', {
+    frame: 'chrome',
+    width: 1024,
+    height: 768,
+    minWidth: 1024,
+    minHeight: 768
+  });
+});