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diff --git a/Source/WebCore/storage/IDBPendingTransactionMonitor.h b/Source/WebCore/storage/IDBPendingTransactionMonitor.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 IDBPendingTransactionMonitor_h
+#define IDBPendingTransactionMonitor_h
+
+#if ENABLE(INDEXED_DATABASE)
+
+#include <wtf/Noncopyable.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class IDBTransactionBackendInterface;
+
+// This class keeps track of the transactions created during the current
+// Javascript execution context. A transaction is 'pending' if no asynchronous
+// operation is currently queued for it (e.g. an IDBObjectStore::put() or similar).
+// All pending transactions are aborted as soon as execution returns from
+// the script engine.
+//
+// FIXME: move the vector of transactions to TLS. Keeping it static
+// will not work once we add support for workers. Another possible
+// solution is to keep the vector in the ScriptExecutionContext.
+class IDBPendingTransactionMonitor : public Noncopyable {
+public:
+    static void addPendingTransaction(IDBTransactionBackendInterface*);
+    static void removePendingTransaction(IDBTransactionBackendInterface*);
+    static void abortPendingTransactions();
+
+private:
+    IDBPendingTransactionMonitor();
+
+    static Vector<IDBTransactionBackendInterface*>* m_transactions;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(INDEXED_DATABASE)
+
+#endif // IDBPendingTransactionMonitor_h