Add chrome.fileSystem.GetVolumeList().

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

Index: chrome/test/data/extensions/api_test/file_system/get_volume_list/background.js
diff --git a/chrome/test/data/extensions/api_test/file_system/get_volume_list/background.js b/chrome/test/data/extensions/api_test/file_system/get_volume_list/background.js
new file mode 100644
index 0000000000000000000000000000000000000000..44c89ab07891d4ae90df194a0ecbed6adb151cf0
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/file_system/get_volume_list/background.js
@@ -0,0 +1,26 @@
+// Copyright 2015 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 getVolumeList() {
+    chrome.fileSystem.getVolumeList(
+        chrome.test.callbackPass(function(volumeList) {
+          // Drive is not available in a real kiosk session. Hhowever, this test
+          // runs in a normal session (with a user marked as kiosk user) since
+          // executing a real real kiosk session is tests is very complicated.
+          // Whether Drive is available in the real kiosk session is tested
+          // separetely in: chrome/browser/chromeos/login/kiosk_browsertest.cc.
+          chrome.test.assertEq(4, volumeList.length);
+          chrome.test.assertEq('downloads:Downloads', volumeList[0].volumeId);
+          chrome.test.assertTrue(volumeList[0].writable);
+          chrome.test.assertEq('drive:drive-user', volumeList[1].volumeId);
+          chrome.test.assertTrue(volumeList[1].writable);
+
+          chrome.test.assertEq('testing:read-only', volumeList[2].volumeId);
+          chrome.test.assertFalse(volumeList[2].writable);
+          chrome.test.assertEq('testing:writable', volumeList[3].volumeId);
+          chrome.test.assertTrue(volumeList[3].writable);
+        }));
+  }
+]);