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diff --git a/Source/WebCore/page/scrolling/ScrollingTreeFrameScrollingNode.h b/Source/WebCore/page/scrolling/ScrollingTreeFrameScrollingNode.h
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+/*
+ * Copyright (C) 2014 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 "ScrollingTreeScrollingNode.h"
+
+namespace WebCore {
+
+class PlatformWheelEvent;
+class ScrollingTree;
+class ScrollingStateScrollingNode;
+
+class ScrollingTreeFrameScrollingNode : public ScrollingTreeScrollingNode {
+public:
+ virtual ~ScrollingTreeFrameScrollingNode();
+
+ void commitStateBeforeChildren(const ScrollingStateNode&) override;
+
+ // FIXME: We should implement this when we support ScrollingTreeScrollingNodes as children.
+ void updateLayersAfterAncestorChange(const ScrollingTreeNode& /*changedNode*/, const FloatRect& /*fixedPositionRect*/, const FloatSize& /*cumulativeDelta*/) override { }
+
+ void handleWheelEvent(const PlatformWheelEvent&) override = 0;
+ void setScrollPosition(const FloatPoint&) override;
+ void setScrollPositionWithoutContentEdgeConstraints(const FloatPoint&) override = 0;
+
+ void updateLayersAfterViewportChange(const FloatRect& fixedPositionRect, double scale) override = 0;
+ void updateLayersAfterDelegatedScroll(const FloatPoint&) override { }
+
+ SynchronousScrollingReasons synchronousScrollingReasons() const { return m_synchronousScrollingReasons; }
+ bool shouldUpdateScrollLayerPositionSynchronously() const { return m_synchronousScrollingReasons; }
+ bool fixedElementsLayoutRelativeToFrame() const { return m_fixedElementsLayoutRelativeToFrame; }
+
+ FloatSize viewToContentsOffset(const FloatPoint& scrollPosition) const;
+ FloatRect layoutViewportForScrollPosition(const FloatPoint& visibleContentOrigin, float scale) const;
+
+protected:
+ ScrollingTreeFrameScrollingNode(ScrollingTree&, ScrollingNodeID);
+
+ void scrollBy(const FloatSize&);
+ void scrollByWithoutContentEdgeConstraints(const FloatSize&);
+
+ float frameScaleFactor() const { return m_frameScaleFactor; }
+ int headerHeight() const { return m_headerHeight; }
+ int footerHeight() const { return m_footerHeight; }
+ float topContentInset() const { return m_topContentInset; }
+
+ FloatRect layoutViewport() const { return m_layoutViewport; };
+ void setLayoutViewport(const FloatRect& r) { m_layoutViewport = r; };
+
+ FloatPoint minLayoutViewportOrigin() const { return m_minLayoutViewportOrigin; }
+ FloatPoint maxLayoutViewportOrigin() const { return m_maxLayoutViewportOrigin; }
+
+ ScrollBehaviorForFixedElements scrollBehaviorForFixedElements() const { return m_behaviorForFixed; }
+
+private:
+ void dumpProperties(TextStream&, ScrollingStateTreeAsTextBehavior) const override;
+
+ FloatRect m_layoutViewport;
+ FloatPoint m_minLayoutViewportOrigin;
+ FloatPoint m_maxLayoutViewportOrigin;
+
+ float m_frameScaleFactor { 1 };
+ float m_topContentInset { 0 };
+
+ int m_headerHeight { 0 };
+ int m_footerHeight { 0 };
+
+ SynchronousScrollingReasons m_synchronousScrollingReasons { 0 };
+ ScrollBehaviorForFixedElements m_behaviorForFixed { StickToDocumentBounds };
+
+ bool m_fixedElementsLayoutRelativeToFrame { false };
+};
+
+} // namespace WebCore
+
+SPECIALIZE_TYPE_TRAITS_SCROLLING_NODE(ScrollingTreeFrameScrollingNode, isFrameScrollingNode())
+
+#endif // ENABLE(ASYNC_SCROLLING)