Add tests for chrome.fileSystem app API.

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

Index: chrome/test/data/extensions/api_test/file_system/get_display_path/test.js
diff --git a/chrome/test/data/extensions/api_test/file_system/get_display_path/test.js b/chrome/test/data/extensions/api_test/file_system/get_display_path/test.js
new file mode 100644
index 0000000000000000000000000000000000000000..0836e7a998b220c4a5b355b96396f01ebdd1fe67
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/file_system/get_display_path/test.js
@@ -0,0 +1,17 @@
+// 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 getDisplayPath() {
+    chrome.fileSystem.chooseFile(chrome.test.callbackPass(function(entry) {
+      chrome.test.assertEq('open_existing.txt', entry.name);
+      // Test that we can get the display path of the file.
+      chrome.fileSystem.getDisplayPath(entry, chrome.test.callbackPass(
+          function(path) {
+        chrome.test.assertTrue(path.indexOf("file_system") >= 0);
+        chrome.test.assertTrue(path.indexOf("open_existing.txt") >= 0);
+      }));
+    }));
+  }
+]);