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diff --git a/chrome/browser/chromeos/fileapi/file_system_backend_delegate.h b/chrome/browser/chromeos/fileapi/file_system_backend_delegate.h
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+++ b/chrome/browser/chromeos/fileapi/file_system_backend_delegate.h
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+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_FILEAPI_FILE_SYSTEM_BACKEND_DELEGATE_H_
+#define CHROME_BROWSER_CHROMEOS_FILEAPI_FILE_SYSTEM_BACKEND_DELEGATE_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/platform_file.h"
+#include "webkit/common/fileapi/file_system_types.h"
+
+namespace base {
+class Time;
+}  // namespace base
+
+namespace fileapi {
+class AsyncFileUtil;
+class FileSystemContext;
+class FileSystemOperation;
+class FileSystemURL;
+class FileStreamWriter;
+}  // namespace fileapi
+
+namespace webkit_blob {
+class FileStreamReader;
+}  // namespace webkit_blob
+
+namespace chromeos {
+
+// This is delegate interface to inject the implementation of the some methods
+// of FileSystemBackend. The main goal is to inject Drive File System.
+class FileSystemBackendDelegate {
+ public:
+  virtual ~FileSystemBackendDelegate() {}
+
+  // Called from FileSystemBackend::GetAsyncFileUtil().
+  virtual fileapi::AsyncFileUtil* GetAsyncFileUtil(
+      fileapi::FileSystemType type) = 0;
+
+  // Called from FileSystemBackend::CreateFileStreamReader().
+  virtual scoped_ptr<webkit_blob::FileStreamReader> CreateFileStreamReader(
+      const fileapi::FileSystemURL& url,
+      int64 offset,
+      const base::Time& expected_modification_time,
+      fileapi::FileSystemContext* context) = 0;
+
+  // Called from FileSystemBackend::CreateFileStreamWriter().
+  virtual scoped_ptr<fileapi::FileStreamWriter> CreateFileStreamWriter(
+      const fileapi::FileSystemURL& url,
+      int64 offset,
+      fileapi::FileSystemContext* context) = 0;
+
+  // Called from FileSystemBackend::CreateFileSystemOperation().
+  // TODO(hidehiko): Get rid of this method when we merge the
+  // {Remote,Local}FileSystemOperation.
+  virtual fileapi::FileSystemOperation* CreateFileSystemOperation(
+      const fileapi::FileSystemURL& url,
+      fileapi::FileSystemContext* context,
+      base::PlatformFileError* error_code) = 0;
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_FILEAPI_FILE_SYSTEM_BACKEND_DELEGATE_H_