Return Drive mount point by getMountPoints.

chrome/test/data/extensions/api_test/file_browser/mount_test/test.js

 // 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.
 
 // These have to be sync'd with file_browser_private_apitest.cc
 var expectedVolume1 = {
   devicePath: 'device_path1',
   mountPath: 'removable/mount_path1',
   systemPath: 'system_path1',
   filePath: 'file_path1',
@@ skipping 40 matching lines @@
 var expectedDownloadsVolume = {
   mountPath: 'Downloads',
   isReadOnly: false,
 };
 
 // List of expected mount points.
 // NOTE: this has to be synced with values in file_browser_private_apitest.cc
 //       and values sorted by mountPath.
 var expectedMountPoints = [
   {
+    sourcePath: '/special/drive',
+    mountPath: 'drive',
+    volumeType: 'drive',
+    mountCondition: ''
+  },
+  {
     mountPath: 'Downloads',
     volumeType: 'downloads',
     mountCondition: ''
   },
   {
     sourcePath: 'archive_path',
     mountPath: 'archive/archive_mount_path',
     volumeType: 'archive',
     mountCondition: ''
   },
@@ skipping 120 matching lines @@
           chrome.test.assertEq(result.length, expectedMountPoints.length,
               'getMountPoints returned wrong number of mount points.');
           for (var i = 0; i < expectedMountPoints.length; i++) {
             chrome.test.assertTrue(
                 validateObject(result[i], expectedMountPoints[i], 'mountPoint'),
                 'getMountPoints result[' + i + '] not as expected');
           }
     }));
   }
 ]);