Add tests for chrome.fileSystem app API.

chrome/test/data/extensions/api_test/file_system/get_display_path/background.js

Index: chrome/test/data/extensions/api_test/file_system/get_display_path/background.js
diff --git a/chrome/test/data/extensions/api_test/file_system/get_display_path/background.js b/chrome/test/data/extensions/api_test/file_system/get_display_path/background.js
new file mode 100644
index 0000000000000000000000000000000000000000..40ec2b76ba640236c2ecdec4fcaf2c28b8a66834
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/file_system/get_display_path/background.js
@@ -0,0 +1,9 @@
+// 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.
+
+function onLaunched() {
+  chrome.appWindow.create('test.html');
+}
+
+chrome.experimental.app.onLaunched.addListener(onLaunched);