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diff --git a/WebCore/storage/IDBTransactionCoordinator.h b/WebCore/storage/IDBTransactionCoordinator.h
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+/*
+ * Copyright (C) 2010 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:
+ *
+ * 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.
+ *
+ * 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 IDBTransactionCoordinator_h
+#define IDBTransactionCoordinator_h
+
+#if ENABLE(INDEXED_DATABASE)
+
+#include "DOMStringList.h"
+#include "IDBTransactionBackendInterface.h"
+#include <wtf/ListHashSet.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class IDBTransactionCallbacks;
+class IDBDatabaseBackendImpl;
+
+// This class manages transactions as follows. Requests for new transactions are
+// always satisfied and the new transaction is placed in a queue.
+// Transactions are not actually started until the first operation is issued.
+// Each transaction executes in a separate thread and is committed automatically
+// when there are no more operations issued in its context.
+// When starting, a transaction will attempt to lock all the object stores in its
+// scope. If this does not happen within a given timeout, an exception is raised.
+// The Coordinator maintains a pool of threads. If there are no threads available
+// the next transaction in the queue will have to wait until a thread becomes
+// available.
+// Transactions are executed in the order the were created.
+class IDBTransactionCoordinator : public RefCounted<IDBTransactionCoordinator> {
+public:
+    static PassRefPtr<IDBTransactionCoordinator> create() { return adoptRef(new IDBTransactionCoordinator()); }
+    virtual ~IDBTransactionCoordinator();
+
+    PassRefPtr<IDBTransactionBackendInterface> createTransaction(DOMStringList* objectStores, unsigned short mode, unsigned long timeout, IDBDatabaseBackendImpl*);
+    void abort(int transactionId);
+
+private:
+    IDBTransactionCoordinator();
+
+    ListHashSet<IDBTransactionBackendInterface*> m_transactionQueue;
+    typedef HashMap<int, RefPtr<IDBTransactionBackendInterface> > IdToTransactionMap;
+    IdToTransactionMap m_idMap;
+    int m_nextID;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(INDEXED_DATABASE)
+
+#endif // IDBTransactionCoordinator_h