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diff --git a/chrome/browser/chromeos/drive/file_system_backend_delegate.h b/chrome/browser/chromeos/drive/file_system_backend_delegate.h
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+++ b/chrome/browser/chromeos/drive/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_DRIVE_FILE_SYSTEM_BACKEND_DELEGATE_H_
+#define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_BACKEND_DELEGATE_H_
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/chromeos/fileapi/file_system_backend_delegate.h"
+
+namespace fileapi {
+class ExternalMountPoints;
+}  // namespace fileapi
+
+namespace drive {
+
+// Delegate implementation of the some methods in chromeos::FileSystemBackend
+// for Drive file system.
+class FileSystemBackendDelegate : public chromeos::FileSystemBackendDelegate {
+ public:
+  explicit FileSystemBackendDelegate(
+      fileapi::ExternalMountPoints* mount_points);
+  virtual ~FileSystemBackendDelegate();
+
+  // FileSystemBackend::Delegate overrides.
+  virtual fileapi::AsyncFileUtil* GetAsyncFileUtil(
+      fileapi::FileSystemType type) OVERRIDE;
+  virtual scoped_ptr<webkit_blob::FileStreamReader> CreateFileStreamReader(
+      const fileapi::FileSystemURL& url,
+      int64 offset,
+      const base::Time& expected_modification_time,
+      fileapi::FileSystemContext* context) OVERRIDE;
+  virtual scoped_ptr<fileapi::FileStreamWriter> CreateFileStreamWriter(
+      const fileapi::FileSystemURL& url,
+      int64 offset,
+      fileapi::FileSystemContext* context) OVERRIDE;
+  virtual fileapi::FileSystemOperation* CreateFileSystemOperation(
+      const fileapi::FileSystemURL& url,
+      fileapi::FileSystemContext* context,
+      base::PlatformFileError* error_code) OVERRIDE;
+
+ private:
+  scoped_refptr<fileapi::ExternalMountPoints> mount_points_;
+
+  DISALLOW_COPY_AND_ASSIGN(FileSystemBackendDelegate);
+};
+
+}  // namespace drive
+
+#endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_BACKEND_DELEGATE_H_