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diff --git a/webkit/fileapi/file_system_directory_database.h b/webkit/fileapi/file_system_directory_database.h
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+++ b/webkit/fileapi/file_system_directory_database.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_FILEAPI_FILE_SYSTEM_DIRECTORY_DATABASE_H
+#define WEBKIT_FILEAPI_FILE_SYSTEM_DIRECTORY_DATABASE_H
+
+#include <string>
+#include <vector>
+
+#include "base/file_path.h"
+#include "base/scoped_ptr.h"
+#include "base/time.h"
+#include "third_party/leveldb/include/leveldb/db.h"
+
+namespace leveldb {
+class WriteBatch;
+}
+
+namespace fileapi {
+
+// This class WILL NOT protect you against producing directory loops, giving an
+// empty directory a backing data file, giving two files the same backing file,
+// or pointing to a nonexistent backing file.  It does no file IO other than
+// that involved with talking to its underlying database.  It does not create or
+// in any way touch real files; it only creates path entries in its database.
+
+// TODO(ericu): Safe mode, which does more checks such as the above on debug
+// builds.
+// TODO(ericu): FSCK, for a full-database check [data file validation possibly
+// done elsewhere].
+// TODO(ericu): Add a method that will give a unique filename for a data file.
+class FileSystemDirectoryDatabase {
+ public:
+  typedef int64 FileId;
+
+  struct FileInfo {
+    FileInfo();
+    ~FileInfo();
+
+    bool is_directory() {
+      return data_path.empty();
+    }
+
+    FileId parent_id;
+    FilePath data_path;
+    std::string name;
+    // We could get this from the file if we touched it on every move.
+    base::Time modification_time;
+  };
+
+  FileSystemDirectoryDatabase(const FilePath& path);
+  ~FileSystemDirectoryDatabase();
+
+  bool GetChildWithName(
+      FileId parent_id, const std::string& name, FileId* child_id);
+  // ListChildren will succeed, returning 0 children, if parent_id doesn't
+  // exist.
+  bool ListChildren(FileId parent_id, std::vector<FileId>* children);
+  bool GetFileInfo(FileId file_id, FileInfo* info);
+  bool AddFileInfo(const FileInfo& info, FileId* file_id);
+  bool RemoveFileInfo(FileId file_id);
+  // This does a full update of the FileInfo, and is what you'd use for moves
+  // and renames.  If you just want to update the modification_time, use
+  // UpdateModificationTime.
+  bool UpdateFileInfo(FileId file_id, const FileInfo& info);
+  bool UpdateModificationTime(
+      FileId file_id, const base::Time& modification_time);
+
+ private:
+  bool Init();
+  bool GetLastFileId(FileId* file_id);
+  bool VerifyIsDirectory(FileId file_id);
+  bool AddFileInfoHelper(
+    const FileInfo& info, FileId file_id, leveldb::WriteBatch* batch);
+  bool RemoveFileInfoHelper(FileId file_id, leveldb::WriteBatch* batch);
+  void HandleError(leveldb::Status status);
+
+  std::string path_;
+  scoped_ptr<leveldb::DB> db_;
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_FILE_SYSTEM_DIRECTORY_DATABASE_H