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diff --git a/Source/WebCore/platform/ScrollAnimatorWin.h b/Source/WebCore/platform/ScrollAnimatorWin.h
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+++ b/Source/WebCore/platform/ScrollAnimatorWin.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:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. 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 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 ScrollAnimatorWin_h
+#define ScrollAnimatorWin_h
+
+#if ENABLE(SMOOTH_SCROLLING)
+
+#include "ScrollAnimator.h"
+#include "Timer.h"
+
+namespace WebCore {
+
+class ScrollAnimatorWin : public ScrollAnimator {
+public:
+    ScrollAnimatorWin(ScrollbarClient*);
+    virtual ~ScrollAnimatorWin();
+
+    virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, float multiplier);
+    virtual void setScrollPositionAndStopAnimation(ScrollbarOrientation, float);
+
+private:
+    struct PerAxisData {
+        PerAxisData(ScrollAnimatorWin* parent, float* currentPos);
+
+        float* m_currentPos;
+        float m_desiredPos;
+        float m_currentVelocity;
+        float m_desiredVelocity;
+        double m_lastAnimationTime;
+        Timer<ScrollAnimatorWin> m_animationTimer;
+    };
+
+    static double accelerationTime();
+    static const double animationTimerDelay;
+
+    void animationTimerFired(Timer<ScrollAnimatorWin>*);
+    void stopAnimationTimerIfNeeded(PerAxisData*);
+    void animateScroll(PerAxisData*);
+
+    PerAxisData m_horizontalData;
+    PerAxisData m_verticalData;
+};
+
+}
+
+#endif // ENABLE(SMOOTH_SCROLLING)
+
+#endif