Rework compositor touch hit testing

Source/core/rendering/RenderView.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 19 matching lines @@
 
 namespace WebCore {
 
 class CustomFilterGlobalContext;
 class FlowThreadController;
 class RenderLayerCompositor;
 class RenderLazyBlock;
 class RenderQuote;
 class RenderWidget;
 
+// The root of the render tree, corresponding to the CSS initial containing block.
+// It's dimensions match that of the viewport, and it is always at position (0,0)
+// relative to the document (and so isn't necessarily in view).
 class RenderView FINAL : public RenderBlock {
 public:
     explicit RenderView(Document*);
     virtual ~RenderView();
 
     bool hitTest(const HitTestRequest&, HitTestResult&);
     bool hitTest(const HitTestRequest&, const HitTestLocation&, HitTestResult&);
 
     virtual const char* renderName() const OVERRIDE { return "RenderView"; }
 
@@ skipping 146 matching lines @@
     
     virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) OVERRIDE;
 
     virtual bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const OVERRIDE FINAL;
 
 protected:
     virtual void mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0) const OVERRIDE;
     virtual const RenderObject* pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&) const OVERRIDE;
     virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const;
     virtual bool requiresColumns(int desiredColumnCount) const OVERRIDE;
+    virtual void computeOwnHitTestRects(Vector<IntRect>&, const LayoutPoint& layerOffset) const OVERRIDE;
     
 private:
     bool initializeLayoutState(LayoutState&);
 
     virtual void calcColumnWidth() OVERRIDE;
     virtual ColumnInfo::PaginationUnit paginationUnit() const OVERRIDE;
 
     bool shouldRepaint(const LayoutRect&) const;
 
     // These functions may only be accessed by LayoutStateMaintainer.
@@ skipping 183 matching lines @@
     RenderObject::FlowThreadState m_flowThreadState;
     bool m_fragmenting;
 #ifndef NDEBUG
     LayoutState* m_layoutState;
 #endif
 };
 
 } // namespace WebCore
 
 #endif // RenderView_h