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diff --git a/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.h b/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.h
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+/*
+ * Copyright (C) 2014-2015 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.
+ */
+
+#ifndef RemoteScrollingCoordinatorProxy_h
+#define RemoteScrollingCoordinatorProxy_h
+
+#if ENABLE(ASYNC_SCROLLING)
+
+#include "MessageReceiver.h"
+#include "RemoteScrollingCoordinator.h"
+#include "RemoteScrollingTree.h"
+#include <wtf/Noncopyable.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+class FloatPoint;
+class PlatformWheelEvent;
+}
+
+namespace WebKit {
+
+class RemoteLayerTreeHost;
+class RemoteScrollingCoordinatorTransaction;
+class RemoteScrollingTree;
+class WebPageProxy;
+
+class RemoteScrollingCoordinatorProxy {
+    WTF_MAKE_NONCOPYABLE(RemoteScrollingCoordinatorProxy);
+public:
+    explicit RemoteScrollingCoordinatorProxy(WebPageProxy&);
+    virtual ~RemoteScrollingCoordinatorProxy();
+
+    bool visualViewportEnabled() const { return m_scrollingTree && m_scrollingTree->visualViewportEnabled(); }
+
+    // Inform the web process that the scroll position changed (called from the scrolling tree)
+    void scrollingTreeNodeDidScroll(WebCore::ScrollingNodeID, const WebCore::FloatPoint& newScrollPosition, const std::optional<WebCore::FloatPoint>& layoutViewportOrigin, WebCore::ScrollingLayerPositionAction);
+    void scrollingTreeNodeRequestsScroll(WebCore::ScrollingNodeID, const WebCore::FloatPoint& scrollPosition, bool representsProgrammaticScroll);
+
+    WebCore::TrackingType eventTrackingTypeForPoint(const AtomicString& eventName, WebCore::IntPoint) const;
+
+    // Called externally when native views move around.
+    void viewportChangedViaDelegatedScrolling(WebCore::ScrollingNodeID, const WebCore::FloatRect& fixedPositionRect, double scale);
+
+    void currentSnapPointIndicesDidChange(WebCore::ScrollingNodeID, unsigned horizontal, unsigned vertical);
+
+    // FIXME: expose the tree and pass this to that?
+    bool handleWheelEvent(const WebCore::PlatformWheelEvent&);
+    
+    WebCore::ScrollingNodeID rootScrollingNodeID() const;
+
+    const RemoteLayerTreeHost* layerTreeHost() const;
+
+    struct RequestedScrollInfo {
+        bool requestsScrollPositionUpdate { };
+        bool requestIsProgrammaticScroll { };
+        WebCore::FloatPoint requestedScrollPosition;
+    };
+    void commitScrollingTreeState(const RemoteScrollingCoordinatorTransaction&, RequestedScrollInfo&);
+
+    void setPropagatesMainFrameScrolls(bool propagatesMainFrameScrolls) { m_propagatesMainFrameScrolls = propagatesMainFrameScrolls; }
+    bool propagatesMainFrameScrolls() const { return m_propagatesMainFrameScrolls; }
+    bool hasFixedOrSticky() const { return m_scrollingTree->hasFixedOrSticky(); }
+
+#if PLATFORM(IOS)
+    WebCore::FloatRect customFixedPositionRect() const;
+    void scrollingTreeNodeWillStartPanGesture();
+    void scrollingTreeNodeWillStartScroll();
+    void scrollingTreeNodeDidEndScroll();
+#if ENABLE(CSS_SCROLL_SNAP)
+    void adjustTargetContentOffsetForSnapping(CGSize maxScrollDimensions, CGPoint velocity, CGFloat topInset, CGPoint* targetContentOffset);
+    bool hasActiveSnapPoint() const;
+    CGPoint nearestActiveContentInsetAdjustedSnapPoint(CGFloat topInset, const CGPoint&) const;
+    bool shouldSetScrollViewDecelerationRateFast() const;
+#endif
+#endif
+
+    String scrollingTreeAsText() const;
+
+private:
+    void connectStateNodeLayers(WebCore::ScrollingStateTree&, const RemoteLayerTreeHost&);
+#if ENABLE(CSS_SCROLL_SNAP)
+    bool shouldSnapForMainFrameScrolling(WebCore::ScrollEventAxis) const;
+    float closestSnapOffsetForMainFrameScrolling(WebCore::ScrollEventAxis, float scrollDestination, float velocity, unsigned& closestIndex) const;
+#endif
+
+    WebPageProxy& m_webPageProxy;
+    RefPtr<RemoteScrollingTree> m_scrollingTree;
+    RequestedScrollInfo* m_requestedScrollInfo;
+#if ENABLE(CSS_SCROLL_SNAP)
+    unsigned m_currentHorizontalSnapPointIndex { 0 };
+    unsigned m_currentVerticalSnapPointIndex { 0 };
+#endif
+    bool m_propagatesMainFrameScrolls;
+};
+
+} // namespace WebKit
+
+#endif // ENABLE(ASYNC_SCROLLING)
+
+#endif // RemoteScrollingCoordinatorProxy_h