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diff --git a/Source/WebCore/dom/EventQueue.h b/Source/WebCore/dom/EventQueue.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 COMPUTER, INC. ``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 COMPUTER, INC. OR
+ * 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 EventQueue_h
+#define EventQueue_h
+
+#include <wtf/HashSet.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/OwnPtr.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class Event;
+class EventQueueTimer;
+class Node;
+class ScriptExecutionContext;
+
+class EventQueue {
+    WTF_MAKE_NONCOPYABLE(EventQueue);
+
+    
+public:
+    enum ScrollEventTargetType {
+        ScrollEventDocumentTarget,
+        ScrollEventElementTarget
+    };
+
+    static PassOwnPtr<EventQueue> create(ScriptExecutionContext* context)
+    {
+        return adoptPtr(new EventQueue(context));
+    }
+
+    ~EventQueue();
+
+    void enqueueEvent(PassRefPtr<Event>);
+    void enqueueScrollEvent(PassRefPtr<Node>, ScrollEventTargetType);
+
+private:
+    explicit EventQueue(ScriptExecutionContext*);
+
+    void pendingEventTimerFired();
+    void dispatchEvent(PassRefPtr<Event>);
+
+    OwnPtr<EventQueueTimer> m_pendingEventTimer;
+    Vector<RefPtr<Event> > m_queuedEvents;
+    HashSet<Node*> m_nodesWithQueuedScrollEvents;
+    
+    friend class EventQueueTimer;    
+};
+
+}
+
+#endif // EventQueue_h