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diff --git a/Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h b/Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h
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+++ b/Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h
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+/*
+ * Copyright (C) 2012 Apple 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 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.
+ */
+
+#pragma once
+
+#if ENABLE(ASYNC_SCROLLING)
+
+#include "IntRect.h"
+#include "ScrollSnapOffsetsInfo.h"
+#include "ScrollTypes.h"
+#include "ScrollingCoordinator.h"
+#include "ScrollingTreeNode.h"
+
+namespace WebCore {
+
+class ScrollingTree;
+class ScrollingStateScrollingNode;
+
+class ScrollingTreeScrollingNode : public ScrollingTreeNode {
+public:
+    virtual ~ScrollingTreeScrollingNode();
+
+    WEBCORE_EXPORT void commitStateBeforeChildren(const ScrollingStateNode&) override;
+    WEBCORE_EXPORT void commitStateAfterChildren(const ScrollingStateNode&) override;
+
+    WEBCORE_EXPORT void updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta) override;
+
+    virtual void handleWheelEvent(const PlatformWheelEvent&) = 0;
+    WEBCORE_EXPORT virtual void setScrollPosition(const FloatPoint&);
+    WEBCORE_EXPORT virtual void setScrollPositionWithoutContentEdgeConstraints(const FloatPoint&);
+
+    virtual void updateLayersAfterViewportChange(const FloatRect& fixedPositionRect, double scale) = 0;
+    virtual void updateLayersAfterDelegatedScroll(const FloatPoint&) { }
+
+    virtual FloatPoint scrollPosition() const = 0;
+
+#if ENABLE(CSS_SCROLL_SNAP)
+    const Vector<float>& horizontalSnapOffsets() const { return m_snapOffsetsInfo.horizontalSnapOffsets; }
+    const Vector<float>& verticalSnapOffsets() const { return m_snapOffsetsInfo.verticalSnapOffsets; }
+    const Vector<ScrollOffsetRange<float>>& horizontalSnapOffsetRanges() const { return m_snapOffsetsInfo.horizontalSnapOffsetRanges; }
+    const Vector<ScrollOffsetRange<float>>& verticalSnapOffsetRanges() const { return m_snapOffsetsInfo.verticalSnapOffsetRanges; }
+    unsigned currentHorizontalSnapPointIndex() const { return m_currentHorizontalSnapPointIndex; }
+    unsigned currentVerticalSnapPointIndex() const { return m_currentVerticalSnapPointIndex; }
+    void setCurrentHorizontalSnapPointIndex(unsigned index) { m_currentHorizontalSnapPointIndex = index; }
+    void setCurrentVerticalSnapPointIndex(unsigned index) { m_currentVerticalSnapPointIndex = index; }
+#endif
+
+protected:
+    ScrollingTreeScrollingNode(ScrollingTree&, ScrollingNodeType, ScrollingNodeID);
+
+    WEBCORE_EXPORT virtual FloatPoint minimumScrollPosition() const;
+    WEBCORE_EXPORT virtual FloatPoint maximumScrollPosition() const;
+
+    virtual void setScrollLayerPosition(const FloatPoint&, const FloatRect& layoutViewport) = 0;
+
+    FloatPoint lastCommittedScrollPosition() const { return m_lastCommittedScrollPosition; }
+    const FloatSize& scrollableAreaSize() const { return m_scrollableAreaSize; }
+    const FloatSize& totalContentsSize() const { return m_totalContentsSize; }
+    const FloatSize& reachableContentsSize() const { return m_reachableContentsSize; }
+    const IntPoint& scrollOrigin() const { return m_scrollOrigin; }
+
+    // If the totalContentsSize changes in the middle of a rubber-band, we still want to use the old totalContentsSize for the sake of
+    // computing the stretchAmount(). Using the old value will keep the animation smooth. When there is no rubber-band in progress at
+    // all, m_totalContentsSizeForRubberBand should be equivalent to m_totalContentsSize.
+    const FloatSize& totalContentsSizeForRubberBand() const { return m_totalContentsSizeForRubberBand; }
+    void setTotalContentsSizeForRubberBand(const FloatSize& totalContentsSizeForRubberBand) { m_totalContentsSizeForRubberBand = totalContentsSizeForRubberBand; }
+
+    ScrollElasticity horizontalScrollElasticity() const { return m_scrollableAreaParameters.horizontalScrollElasticity; }
+    ScrollElasticity verticalScrollElasticity() const { return m_scrollableAreaParameters.verticalScrollElasticity; }
+
+    bool hasEnabledHorizontalScrollbar() const { return m_scrollableAreaParameters.hasEnabledHorizontalScrollbar; }
+    bool hasEnabledVerticalScrollbar() const { return m_scrollableAreaParameters.hasEnabledVerticalScrollbar; }
+
+    bool canHaveScrollbars() const { return m_scrollableAreaParameters.horizontalScrollbarMode != ScrollbarAlwaysOff || m_scrollableAreaParameters.verticalScrollbarMode != ScrollbarAlwaysOff; }
+
+    WEBCORE_EXPORT void dumpProperties(TextStream&, ScrollingStateTreeAsTextBehavior) const override;
+
+private:
+    FloatSize m_scrollableAreaSize;
+    FloatSize m_totalContentsSize;
+    FloatSize m_totalContentsSizeForRubberBand;
+    FloatSize m_reachableContentsSize;
+    FloatPoint m_lastCommittedScrollPosition;
+    IntPoint m_scrollOrigin;
+#if ENABLE(CSS_SCROLL_SNAP)
+    ScrollSnapOffsetsInfo<float> m_snapOffsetsInfo;
+    unsigned m_currentHorizontalSnapPointIndex { 0 };
+    unsigned m_currentVerticalSnapPointIndex { 0 };
+#endif
+    ScrollableAreaParameters m_scrollableAreaParameters;
+};
+
+} // namespace WebCore
+
+SPECIALIZE_TYPE_TRAITS_SCROLLING_NODE(ScrollingTreeScrollingNode, isScrollingNode())
+
+#endif // ENABLE(ASYNC_SCROLLING)