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diff --git a/Source/WebCore/platform/sql/SQLiteFileSystem.h b/Source/WebCore/platform/sql/SQLiteFileSystem.h
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+/*
+ * Copyright (C) 2009 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef SQLiteFileSystem_h
+#define SQLiteFileSystem_h
+
+#include "PlatformString.h"
+#include <wtf/Threading.h>
+
+struct sqlite3;
+
+namespace WebCore {
+
+class SQLiteDatabase;
+
+// A class that abstracts the file system related operations required
+// by the WebKit database code.
+class SQLiteFileSystem {
+public:
+    // Registers a user-defined SQLite VFS.
+    static void registerSQLiteVFS();
+
+    // Opens a database file.
+    //
+    // fileName - The name of the database file.
+    // database - The SQLite structure that represents the database stored
+    //            in the given file.
+    // forWebSQLDatabase - True, if and only if we're opening a Web SQL Database file.
+    //                     Used by Chromium to determine if the DB file needs to be opened
+    //                     using a custom VFS.
+    static int openDatabase(const String& fileName, sqlite3** database, bool forWebSQLDatabase);
+
+    // Returns the file name for a database.
+    //
+    // dbDir - The directory where all databases are stored.
+    // dbName - The name of the database.
+    // originIdentifier - The origin that wants to use this database.
+    // db - A database with a number generator used to create unique file names.
+    static String getFileNameForNewDatabase(const String& dbDir, const String& dbName,
+                                            const String& originIdentifier, SQLiteDatabase* db);
+
+    // Creates an absolute file path given a directory and a file name.
+    //
+    // path - The directory.
+    // fileName - The file name.
+    static String appendDatabaseFileNameToPath(const String& path, const String& fileName);
+
+    // Makes sure the given directory exists, by creating all missing directories
+    // on the given path.
+    //
+    // path - The directory.
+    static bool ensureDatabaseDirectoryExists(const String& path);
+
+    // If 'checkPathOnly' is false, then this method only checks if the given file exists.
+    // If 'checkPathOnly' is true, then this method makes sure all directories on the
+    // given path exist by creating the missing ones, and does not check if the file
+    // itself exists.
+    //
+    // Sometimes we expect a DB file to exist; other times, we're OK with creating a new
+    // DB file, but we want to make sure that the directory in which we want to put the
+    // new DB file exists. This method covers both cases.
+    //
+    // fileName - The file name.
+    // checkPathOnly - If true, we only make sure that the given directory exists.
+    //                 If false, we only check if the file exists.
+    static bool ensureDatabaseFileExists(const String& fileName, bool checkPathOnly);
+
+    // Deletes an empty database directory.
+    //
+    // path - The directory.
+    static bool deleteEmptyDatabaseDirectory(const String& path);
+
+    // Deletes a database file.
+    //
+    // fileName - The file name.
+    static bool deleteDatabaseFile(const String& fileName);
+
+    // Returns the size of the database file.
+    //
+    // fileName - The file name.
+    static long long getDatabaseFileSize(const String& fileName);
+
+private:
+    // do not instantiate this class
+    SQLiteFileSystem();
+}; // class SQLiteFileSystem
+
+} // namespace WebCore
+
+#endif