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diff --git a/WebCore/platform/ThreadTimers.h b/WebCore/platform/ThreadTimers.h
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+/*
+ * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
+ * Copyright (C) 2009 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 ThreadTimer_h
+#define ThreadTimer_h
+
+#include <wtf/Noncopyable.h>
+#include <wtf/HashSet.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+    class SharedTimer;
+    class TimerBase;
+
+    // A collection of timers per thread. Kept in ThreadGlobalData.
+    class ThreadTimers : Noncopyable {
+    public:
+        ThreadTimers();
+
+        // On a thread different then main, we should set the thread's instance of the SharedTimer.
+        void setSharedTimer(SharedTimer*);
+
+        Vector<TimerBase*>& timerHeap() { return m_timerHeap; }
+        HashSet<const TimerBase*>& timersReadyToFire() { return m_timersReadyToFire; }
+
+        void updateSharedTimer();
+        void fireTimersInNestedEventLoop();
+
+    private:
+        static void sharedTimerFired();
+
+        void fireTimers(double fireTime, const Vector<TimerBase*>&);
+        void collectFiringTimers(double fireTime, Vector<TimerBase*>&);
+        void sharedTimerFiredInternal();
+        void fireTimersInNestedEventLoopInternal();
+
+        Vector<TimerBase*> m_timerHeap;
+        HashSet<const TimerBase*> m_timersReadyToFire; // Temporarily holds a pointer to a stack object. No ownership.
+        SharedTimer* m_sharedTimer; // External object, can be a run loop on a worker thread. Normally set/reset by worker thread.
+        bool m_firingTimers; // Reentrancy guard.
+    };
+
+}
+
+#endif