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diff --git a/webkit/chromeos/fileapi/file_access_permissions.h b/webkit/chromeos/fileapi/file_access_permissions.h
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+++ b/webkit/chromeos/fileapi/file_access_permissions.h
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+// Copyright (c) 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_CHROMEOS_FILEAPI_FILE_ACCESS_PERMISSIONS_H_
+#define WEBKIT_CHROMEOS_FILEAPI_FILE_ACCESS_PERMISSIONS_H_
+#pragma once
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "base/file_path.h"
+#include "base/synchronization/lock.h"
+
+class Extension;
+
+namespace chromeos {
+
+class FileAccessPermissions {
+ public:
+  FileAccessPermissions();
+  virtual ~FileAccessPermissions();
+
+  // Grants |extension_id| access to |path|.
+  void GrantAccessPermission(const std::string& extension_id,
+                             const FilePath& path);
+  // Checks id |extension_id| has permission to access to |path|.
+  bool HasAccessPermission(const std::string& extension_id,
+                           const FilePath& path);
+  // Revokes all file permissions for |extension_id|.
+  void RevokePermissions(const std::string& extension_id);
+
+ private:
+  typedef std::set<FilePath> PathSet;
+  typedef std::map<std::string, PathSet> PathAccessMap;
+
+  base::Lock lock_;  // Synchronize all access to path_map_.
+  PathAccessMap path_map_;
+};
+
+};
+
+#endif  // WEBKIT_CHROMEOS_FILEAPI_FILE_ACCESS_PERMISSIONS_H_