[WIP] Provided file system from NACL.

chrome/common/extensions/api/file_manager_private.idl

 // Copyright 2013 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.
 
 // fileManagerPrivate API.
 // This is a private API used by the file browser of ChromeOS.
 [platforms=("chromeos"),
  implemented_in="chrome/browser/chromeos/extensions/file_manager/file_manager_private_api_functions.h"]
 namespace fileManagerPrivate {
 // Type of the mounted volume.
 enum VolumeType { drive, downloads, removable, archive, provided, mtp,
-                  testing };
+                  testing, plugin_provided };
 
 // Device type. Available if this is removable volume.
 enum DeviceType { usb, sd, optical, mobile, unknown };
 
 // Additional data about mount, for example, that the filesystem is not
 // supported.
 enum MountCondition { unknown, unsupported };
 
 // Additional information of the context the volume was mounted.
 enum MountContext { user, auto };
@@ skipping 904 matching lines @@
 
   static void onPreferencesChanged();
 
   static void onDriveConnectionStatusChanged();
 
   static void onDeviceChanged(DeviceEvent event);
 
   static void onDriveSyncError(DriveSyncErrorEvent event);
 };
 };