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diff --git a/Source/WebCore/storage/DatabaseTask.h b/Source/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
+
+#if ENABLE(DATABASE)
+#include "Database.h"
+#include "ExceptionCode.h"
+#include "PlatformString.h"
+#include "SQLTransaction.h"
+#include <wtf/OwnPtr.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/Threading.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+// Can be used to wait until DatabaseTask is completed.
+// Has to be passed into DatabaseTask::create to be associated with the task.
+class DatabaseTaskSynchronizer : public Noncopyable {
+public:
+    DatabaseTaskSynchronizer();
+
+    // Called from main thread to wait until task is completed.
+    void waitForTaskCompletion();
+
+    // Called by the task.
+    void taskCompleted();
+
+#ifndef NDEBUG
+    bool hasCheckedForTermination() const { return m_hasCheckedForTermination; }
+    void setHasCheckedForTermination() { m_hasCheckedForTermination = true; }
+#endif
+
+private:
+    bool m_taskCompleted;
+    Mutex m_synchronousMutex;
+    ThreadCondition m_synchronousCondition;
+#ifndef NDEBUG
+    bool m_hasCheckedForTermination;
+#endif
+};
+
+class DatabaseTask : public Noncopyable {
+public:
+    virtual ~DatabaseTask();
+
+    void performTask();
+
+    Database* database() const { return m_database; }
+#ifndef NDEBUG
+    bool hasSynchronizer() const { return m_synchronizer; }
+    bool hasCheckedForTermination() const { return m_synchronizer->hasCheckedForTermination(); }
+#endif
+
+protected:
+    DatabaseTask(Database*, DatabaseTaskSynchronizer*);
+
+private:
+    virtual void doPerformTask() = 0;
+
+    Database* m_database;
+    DatabaseTaskSynchronizer* m_synchronizer;
+
+#ifndef NDEBUG
+    virtual const char* debugTaskName() const = 0;
+    bool m_complete;
+#endif
+};
+
+class Database::DatabaseOpenTask : public DatabaseTask {
+public:
+    static PassOwnPtr<DatabaseOpenTask> create(Database* db, bool setVersionInNewDatabase, DatabaseTaskSynchronizer* synchronizer, ExceptionCode& code, bool& success)
+    {
+        return adoptPtr(new DatabaseOpenTask(db, setVersionInNewDatabase, synchronizer, code, success));
+    }
+
+private:
+    DatabaseOpenTask(Database*, bool setVersionInNewDatabase, DatabaseTaskSynchronizer*, ExceptionCode&, bool& success);
+
+    virtual void doPerformTask();
+#ifndef NDEBUG
+    virtual const char* debugTaskName() const;
+#endif
+
+    bool m_setVersionInNewDatabase;
+    ExceptionCode& m_code;
+    bool& m_success;
+};
+
+class Database::DatabaseCloseTask : public DatabaseTask {
+public:
+    static PassOwnPtr<DatabaseCloseTask> create(Database* db, DatabaseTaskSynchronizer* synchronizer)
+    {
+        return adoptPtr(new DatabaseCloseTask(db, synchronizer));
+    }
+
+private:
+    DatabaseCloseTask(Database*, DatabaseTaskSynchronizer*);
+
+    virtual void doPerformTask();
+#ifndef NDEBUG
+    virtual const char* debugTaskName() const;
+#endif
+};
+
+class Database::DatabaseTransactionTask : public DatabaseTask {
+public:
+    // Transaction task is never synchronous, so no 'synchronizer' parameter.
+    static PassOwnPtr<DatabaseTransactionTask> create(PassRefPtr<SQLTransaction> transaction)
+    {
+        return adoptPtr(new DatabaseTransactionTask(transaction));
+    }
+
+    SQLTransaction* transaction() const { return m_transaction.get(); }
+
+private:
+    DatabaseTransactionTask(PassRefPtr<SQLTransaction>);
+
+    virtual void doPerformTask();
+#ifndef NDEBUG
+    virtual const char* debugTaskName() const;
+#endif
+
+    RefPtr<SQLTransaction> m_transaction;
+};
+
+class Database::DatabaseTableNamesTask : public DatabaseTask {
+public:
+    static PassOwnPtr<DatabaseTableNamesTask> create(Database* db, DatabaseTaskSynchronizer* synchronizer, Vector<String>& names)
+    {
+        return adoptPtr(new DatabaseTableNamesTask(db, synchronizer, names));
+    }
+
+private:
+    DatabaseTableNamesTask(Database*, DatabaseTaskSynchronizer*, Vector<String>& names);
+
+    virtual void doPerformTask();
+#ifndef NDEBUG
+    virtual const char* debugTaskName() const;
+#endif
+
+    Vector<String>& m_tableNames;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(DATABASE)
+#endif // DatabaseTask_h