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diff --git a/Source/WebCore/platform/ScrollAnimation.h b/Source/WebCore/platform/ScrollAnimation.h
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+/*
+ * Copyright (C) 2016 Igalia S.L.
+ *
+ * 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 INC. AND ITS 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 APPLE INC. OR ITS 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 ScrollAnimation_h
+#define ScrollAnimation_h
+
+#include "ScrollTypes.h"
+
+namespace WebCore {
+
+class FloatPoint;
+class ScrollableArea;
+
+class ScrollAnimation {
+public:
+    virtual ~ScrollAnimation() { };
+    virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, float multiplier) = 0;
+    virtual void stop() = 0;
+    virtual void updateVisibleLengths() = 0;
+    virtual void setCurrentPosition(const FloatPoint&) = 0;
+    virtual void serviceAnimation() { };
+
+protected:
+    ScrollAnimation(ScrollableArea& scrollableArea)
+        : m_scrollableArea(scrollableArea)
+    {
+    }
+
+    ScrollableArea& m_scrollableArea;
+};
+
+} // namespace WebCore
+
+#endif // ScrollAnimation_h