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diff --git a/WebCore/storage/DatabaseTask.h b/WebCore/storage/DatabaseTask.h
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+/*
+ * Copyright (C) 2007, 2008 Apple 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:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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 DatabaseTask_h
+#define DatabaseTask_h
+
+#include "ExceptionCode.h"
+#include "PlatformString.h"
+#include <wtf/OwnPtr.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/Threading.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class Database;
+class DatabaseThread;
+class SQLValue;
+class SQLCallback;
+class SQLTransaction;
+class VersionChangeCallback;
+
+class DatabaseTask : public ThreadSafeShared<DatabaseTask>
+{
+    friend class Database;
+public:
+    virtual ~DatabaseTask();
+
+    void performTask();
+
+    Database* database() const { return m_database; }
+    bool isComplete() const { return m_complete; }
+
+protected:
+    DatabaseTask(Database*);
+
+private:
+    virtual void doPerformTask() = 0;
+#ifndef NDEBUG
+    virtual const char* debugTaskName() const = 0;
+#endif
+
+    void lockForSynchronousScheduling();
+    void waitForSynchronousCompletion();
+
+    Database* m_database;
+
+    bool m_complete;
+
+    OwnPtr<Mutex> m_synchronousMutex;
+    OwnPtr<ThreadCondition> m_synchronousCondition;
+};
+
+class DatabaseOpenTask : public DatabaseTask
+{
+public:
+    static PassRefPtr<DatabaseOpenTask> create(Database* db) { return adoptRef(new DatabaseOpenTask(db)); }
+
+    ExceptionCode exceptionCode() const { return m_code; }
+    bool openSuccessful() const { return m_success; }
+
+private:
+    DatabaseOpenTask(Database*);
+
+    virtual void doPerformTask();
+#ifndef NDEBUG
+    virtual const char* debugTaskName() const;
+#endif
+
+    ExceptionCode m_code;
+    bool m_success;
+};
+
+class DatabaseCloseTask : public DatabaseTask
+{
+public:
+    static PassRefPtr<DatabaseCloseTask> create(Database* db) { return adoptRef(new DatabaseCloseTask(db)); }
+
+private:
+    DatabaseCloseTask(Database*);
+
+    virtual void doPerformTask();
+#ifndef NDEBUG
+    virtual const char* debugTaskName() const;
+#endif
+};
+
+class DatabaseTransactionTask : public DatabaseTask
+{
+public:
+    static PassRefPtr<DatabaseTransactionTask> create(PassRefPtr<SQLTransaction> transaction) { return adoptRef(new DatabaseTransactionTask(transaction)); }
+
+    SQLTransaction* transaction() const { return m_transaction.get(); }
+
+    virtual ~DatabaseTransactionTask();
+private:
+    DatabaseTransactionTask(PassRefPtr<SQLTransaction>);
+
+    virtual void doPerformTask();
+#ifndef NDEBUG
+    virtual const char* debugTaskName() const;
+#endif
+
+    RefPtr<SQLTransaction> m_transaction;
+};
+
+class DatabaseTableNamesTask : public DatabaseTask
+{
+public:
+    static PassRefPtr<DatabaseTableNamesTask> create(Database* db) { return adoptRef(new DatabaseTableNamesTask(db)); }
+
+    Vector<String>& tableNames() { return m_tableNames; }
+
+private:
+    DatabaseTableNamesTask(Database*);
+
+    virtual void doPerformTask();
+#ifndef NDEBUG
+    virtual const char* debugTaskName() const;
+#endif
+
+    Vector<String> m_tableNames;
+};
+
+} // namespace WebCore
+
+#endif // DatabaseTask_h