diff -r 000000000000 -r 6474c204b198 dom/filesystem/PFileSystemRequest.ipdl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/filesystem/PFileSystemRequest.ipdl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,50 @@
+/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PBlob;
+include protocol PContent;
+
+namespace mozilla {
+namespace dom {
+
+struct FileSystemFileResponse
+{
+  PBlob blob;
+};
+
+struct FileSystemDirectoryResponse
+{
+  nsString realPath;
+};
+
+struct FileSystemErrorResponse
+{
+  nsresult error;
+};
+
+struct FileSystemBooleanResponse
+{
+  bool success;
+};
+
+union FileSystemResponseValue
+{
+  FileSystemBooleanResponse;
+  FileSystemDirectoryResponse;
+  FileSystemFileResponse;
+  FileSystemErrorResponse;
+};
+
+sync protocol PFileSystemRequest
+{
+  manager PContent;
+
+child:
+  __delete__(FileSystemResponseValue response);
+};
+
+} // namespace dom
+} // namespace mozilla