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diff --git a/webkit/browser/fileapi/isolated_file_system_backend.h b/webkit/browser/fileapi/isolated_file_system_backend.h
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+++ b/webkit/browser/fileapi/isolated_file_system_backend.h
@@ -0,0 +1,55 @@
+// Copyright (c) 2012 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_BROWSER_FILEAPI_ISOLATED_FILE_SYSTEM_BACKEND_H_
+#define WEBKIT_BROWSER_FILEAPI_ISOLATED_FILE_SYSTEM_BACKEND_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "webkit/browser/fileapi/file_system_backend.h"
+
+namespace fileapi {
+
+class AsyncFileUtilAdapter;
+
+class IsolatedFileSystemBackend : public FileSystemBackend {
+ public:
+  IsolatedFileSystemBackend();
+  virtual ~IsolatedFileSystemBackend();
+
+  // FileSystemBackend implementation.
+  virtual bool CanHandleType(FileSystemType type) const OVERRIDE;
+  virtual void OpenFileSystem(
+      const GURL& origin_url,
+      FileSystemType type,
+      OpenFileSystemMode mode,
+      const OpenFileSystemCallback& callback) OVERRIDE;
+  virtual FileSystemFileUtil* GetFileUtil(FileSystemType type) OVERRIDE;
+  virtual AsyncFileUtil* GetAsyncFileUtil(FileSystemType type) OVERRIDE;
+  virtual CopyOrMoveFileValidatorFactory* GetCopyOrMoveFileValidatorFactory(
+      FileSystemType type,
+      base::PlatformFileError* error_code) OVERRIDE;
+  virtual FileSystemOperation* CreateFileSystemOperation(
+      const FileSystemURL& url,
+      FileSystemContext* context,
+      base::PlatformFileError* error_code) const OVERRIDE;
+  virtual scoped_ptr<webkit_blob::FileStreamReader> CreateFileStreamReader(
+      const FileSystemURL& url,
+      int64 offset,
+      const base::Time& expected_modification_time,
+      FileSystemContext* context) const OVERRIDE;
+  virtual scoped_ptr<FileStreamWriter> CreateFileStreamWriter(
+      const FileSystemURL& url,
+      int64 offset,
+      FileSystemContext* context) const OVERRIDE;
+  virtual FileSystemQuotaUtil* GetQuotaUtil() OVERRIDE;
+
+ private:
+  scoped_ptr<AsyncFileUtilAdapter> isolated_file_util_;
+  scoped_ptr<AsyncFileUtilAdapter> dragged_file_util_;
+  scoped_ptr<AsyncFileUtilAdapter> transient_file_util_;
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_BROWSER_FILEAPI_ISOLATED_FILE_SYSTEM_BACKEND_H_