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diff --git a/WebCore/storage/IDBCallbacks.h b/WebCore/storage/IDBCallbacks.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.
+ * 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 IDBCallbacks_h
+#define IDBCallbacks_h
+
+#include "ActiveDOMObject.h"
+#include "IDBDatabaseError.h"
+#include "Timer.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+#if ENABLE(INDEXED_DATABASE)
+
+namespace WebCore {
+
+// All IndexedDB callbacks must implement this class.  It handles the asynchronous firing of
+// the callbacks.
+template <typename ResultType>
+class IDBCallbacks : public RefCounted<IDBCallbacks<ResultType> >, public ActiveDOMObject {
+public:
+    IDBCallbacks(ScriptExecutionContext* scriptExecutionContext, void* upcastPointer)
+        : ActiveDOMObject(scriptExecutionContext, upcastPointer)
+        , m_timer(this, &IDBCallbacks::timerFired)
+    {
+    }
+
+    virtual ~IDBCallbacks() { }
+
+    void onSuccess(PassRefPtr<ResultType> result)
+    {
+        ASSERT(!m_result);
+        ASSERT(!m_error);
+        m_result = result;
+        ASSERT(m_result);
+
+        ASSERT(!m_timer.isActive());
+        m_selfRef = this;
+        m_timer.startOneShot(0);
+    }
+
+    void onError(PassRefPtr<IDBDatabaseError> error)
+    {
+        ASSERT(!m_result);
+        ASSERT(!m_error);
+        m_error = error;
+        ASSERT(m_error);
+
+        ASSERT(!m_timer.isActive());
+        m_selfRef = this;
+        m_timer.startOneShot(0);
+    }
+
+protected:
+    virtual void onSuccessAsync(PassRefPtr<ResultType>) = 0;
+    virtual void onErrorAsync(PassRefPtr<IDBDatabaseError>) = 0;
+
+    void timerFired(Timer<IDBCallbacks>*)
+    {
+        if (m_result) {
+            onSuccessAsync(m_result);
+            m_result = 0;
+        } else {
+            onErrorAsync(m_error);
+            m_error = 0;
+        }
+        m_selfRef = 0; // May trigger a delete immediately.
+    }
+
+private:
+    Timer<IDBCallbacks> m_timer;
+    RefPtr<IDBCallbacks> m_selfRef;
+    RefPtr<ResultType> m_result;
+    RefPtr<IDBDatabaseError> m_error;
+};
+
+} // namespace WebCore
+
+#endif
+
+#endif // IDBCallbacks_h