Merged FrameView and LayoutBox scrolling in EventHandler.

third_party/WebKit/Source/core/layout/LayoutView.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 192 matching lines @@
     // Some LayoutMedias want to know about their viewport visibility for
     // crbug.com/487345,402044 .  This facility will be removed once those
     // experiments complete.
     // TODO(ojan): Merge this with IntersectionObserver once it lands.
     void registerMediaForPositionChangeNotification(LayoutMedia&);
     void unregisterMediaForPositionChangeNotification(LayoutMedia&);
     // Notify all registered LayoutMedias that their position on-screen might
     // have changed.  visibleRect is the clipping boundary.
     void sendMediaPositionChangeNotifications(const IntRect& visibleRect);
 
+    ScrollResult scroll(ScrollGranularity, const FloatSize&) override;

[skobes, 2016/03/02 23:26:30]

Maybe worth a clarifying comment here to the effect that the rootLayerScrolls
setting determines which ScrollableArea ultimately gets scrolled by this method.

[bokan, 2016/03/02 23:33:19]

Done.

+
 private:
     void mapLocalToAncestor(const LayoutBoxModelObject* ancestor, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = nullptr, const PaintInvalidationState* = nullptr) const override;
 
     const LayoutObject* pushMappingToContainer(const LayoutBoxModelObject* ancestorToStopAt, LayoutGeometryMap&) const override;
     void mapAncestorToLocal(const LayoutBoxModelObject*, TransformState&, MapCoordinatesFlags) const override;
     void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const override;
 
     void layoutContent();
 #if ENABLE(ASSERT)
     void checkLayoutState();
@@ skipping 80 matching lines @@
             m_paintInvalidationState->m_cachedOffsetsEnabled = true;
     }
 private:
     const PaintInvalidationState* m_paintInvalidationState;
     bool m_didDisable;
 };
 
 } // namespace blink
 
 #endif // LayoutView_h