Stackable file_util for FileAPIs. Sample code for discussion. Incomplete. Cannot be compiled.

webkit/fileapi/file_system_url_request_job.h

 // Copyright (c) 2006-2011 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.
 
 #ifndef WEBKIT_FILEAPI_FILE_SYSTEM_URL_REQUEST_JOB_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_URL_REQUEST_JOB_H_
 #pragma once
 
 #include <string>
 
 #include "base/file_path.h"
 #include "base/message_loop_proxy.h"
 #include "base/platform_file.h"
 #include "base/scoped_callback_factory.h"
 #include "base/scoped_ptr.h"
 #include "base/task.h"
 #include "net/base/completion_callback.h"
 #include "net/http/http_byte_range.h"
 #include "net/url_request/url_request_job.h"
+#include "webkit/fileapi/file_system_operation_context.h"
 
 class GURL;
 
 namespace net {
 class FileStream;
 }
 
 namespace fileapi {
 class FileSystemPathManager;
 
@@ skipping 38 matching lines @@
   net::CompletionCallbackImpl<FileSystemURLRequestJob> io_callback_;
   scoped_ptr<net::FileStream> stream_;
   bool is_directory_;
 
   net::HttpByteRange byte_range_;
   int64 remaining_bytes_;
 
   ScopedRunnableMethodFactory<FileSystemURLRequestJob> method_factory_;
   base::ScopedCallbackFactory<FileSystemURLRequestJob> callback_factory_;
   scoped_refptr<base::MessageLoopProxy> file_thread_proxy_;
+  scoped_ptr<FileSystemOperationContext> file_system_operation_context_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemURLRequestJob);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_URL_REQUEST_JOB_H_