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diff --git a/Source/WebCore/platform/ScrollAnimator.h b/Source/WebCore/platform/ScrollAnimator.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 ScrollAnimator_h
+#define ScrollAnimator_h
+
+#include "ScrollTypes.h"
+
+namespace WebCore {
+
+class ScrollbarClient;
+
+class ScrollAnimator {
+public:
+    static ScrollAnimator* create(ScrollbarClient*);
+
+    ScrollAnimator(ScrollbarClient* client);
+    virtual ~ScrollAnimator();
+
+    // Computes a scroll destination for the given parameters.  Returns false if
+    // already at the destination.  Otherwise, starts scrolling towards the
+    // destination and returns true.  Scrolling may be immediate or animated.
+    // The base class implementation always scrolls immediately, never animates.
+    virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, float multiplier);
+
+    // Stops any animation in the given direction and updates the ScrollAnimator
+    // with the current scroll position.  This does not cause a callback to the
+    // ScrollbarClient.
+    virtual void setScrollPositionAndStopAnimation(ScrollbarOrientation, float);
+
+protected:
+    ScrollbarClient* m_client;
+    float m_currentPosX; // We avoid using a FloatPoint in order to reduce
+    float m_currentPosY; // subclass code complexity.
+};
+
+} // namespace WebCore
+#endif