Constify the rendering/ selection code

Source/core/rendering/RenderListMarker.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2010 Daniel Bates (dbates@intudata.com)
  *
  * 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
@@ skipping 1797 matching lines @@
 
 void RenderListMarker::setSelectionState(SelectionState state)
 {
     // The selection state for our containing block hierarchy is updated by the base class call.
     RenderBox::setSelectionState(state);
 
     if (inlineBoxWrapper() && canUpdateSelectionOnRootLineBoxes())
         inlineBoxWrapper()->root().setHasSelectedChildren(state != SelectionNone);
 }
 
-LayoutRect RenderListMarker::selectionRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, bool clipToVisibleContent)
+LayoutRect RenderListMarker::selectionRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, bool clipToVisibleContent) const
 {
     ASSERT(!needsLayout());
 
     if (selectionState() == SelectionNone || !inlineBoxWrapper())
         return LayoutRect();
 
     RootInlineBox& root = inlineBoxWrapper()->root();
     LayoutRect rect(0, root.selectionTop() - y(), width(), root.selectionHeight());
 
     if (clipToVisibleContent)
         mapRectToPaintInvalidationBacking(paintInvalidationContainer, rect, 0);
     else
         rect = localToContainerQuad(FloatRect(rect), paintInvalidationContainer).enclosingBoundingBox();
 
     return rect;
 }
 
 } // namespace blink