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diff --git a/WebCore/xml/XMLHttpRequestProgressEventThrottle.h b/WebCore/xml/XMLHttpRequestProgressEventThrottle.h
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+/*
+ * Copyright (C) 2010 Julien Chaffraix <jchaffraix@webkit.org>
+ * All right 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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 XMLHttpRequestProgressEventThrottle_h
+#define XMLHttpRequestProgressEventThrottle_h
+
+#include "Timer.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/Vector.h"
+
+namespace WebCore {
+
+class Event;
+class EventTarget;
+
+enum ProgressEventAction {
+    DoNotFlushProgressEvent,
+    FlushProgressEvent
+};
+
+// This implements the XHR2 progress event dispatching: "dispatch a progress event called progress
+// about every 50ms or for every byte received, whichever is least frequent".
+class XMLHttpRequestProgressEventThrottle : public TimerBase {
+public:
+    XMLHttpRequestProgressEventThrottle(EventTarget*);
+    virtual ~XMLHttpRequestProgressEventThrottle();
+
+    void dispatchProgressEvent(bool lengthComputable, unsigned loaded, unsigned total);
+    void dispatchEvent(PassRefPtr<Event>, ProgressEventAction = DoNotFlushProgressEvent);
+
+    void suspend();
+    void resume();
+
+    bool suspended() const { return m_suspended; }
+
+private:
+    static const double minimumProgressEventDispatchingIntervalInSeconds;
+
+    virtual void fired();
+    void dispatchPausedEvent();
+    void flushProgressEvent();
+
+    bool hasEventToDispatch() const;
+
+    // Weak pointer to our XMLHttpRequest object as it is the one holding us.
+    EventTarget* m_target;
+
+    bool m_lengthComputable;
+    unsigned m_loaded;
+    unsigned m_total;
+
+    bool m_suspended;
+    RefPtr<Event> m_pausedEvent;
+};
+
+} // namespace WebCore
+
+#endif // XMLHttpRequestProgressEventThrottle_h