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

webkit/fileapi/file_system_dir_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_DIR_URL_REQUEST_JOB_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_DIR_URL_REQUEST_JOB_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/file_path.h"
 #include "base/file_util_proxy.h"
 #include "base/message_loop_proxy.h"
 #include "base/platform_file.h"
 #include "base/scoped_callback_factory.h"
 #include "base/task.h"
 #include "net/url_request/url_request_job.h"
+#include "webkit/fileapi/file_system_operation_context.h"
 
 namespace fileapi {
 class FileSystemPathManager;
 
 // A request job that handles reading filesystem: URLs for directories.
 class FileSystemDirURLRequestJob : public net::URLRequestJob {
  public:
   FileSystemDirURLRequestJob(
       net::URLRequest* request, FileSystemPathManager* path_manager,
       scoped_refptr<base::MessageLoopProxy> file_thread_proxy);
@@ skipping 21 matching lines @@
   void NotifyFailed(int rv);
 
   std::string data_;
   FilePath relative_dir_path_;
   FilePath absolute_dir_path_;
   FileSystemPathManager* const path_manager_;
 
   ScopedRunnableMethodFactory<FileSystemDirURLRequestJob> method_factory_;
   base::ScopedCallbackFactory<FileSystemDirURLRequestJob> callback_factory_;
   scoped_refptr<base::MessageLoopProxy> file_thread_proxy_;
+  scoped_ptr<FileSystemOperationContext> file_system_operation_context_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemDirURLRequestJob);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_DIR_URL_REQUEST_JOB_H_