Add support for parsing <grid-line> that includes a 'span'

Source/core/css/StyleResolver.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * 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 347 matching lines @@
 
         void addMatchedProperties(const StylePropertySet* properties, StyleRule* = 0, unsigned linkMatchType = SelectorChecker::MatchAll, PropertyWhitelistType = PropertyWhitelistNone);
     };
 
 private:
     // This function fixes up the default font size if it detects that the current generic font family has changed. -dwh
     void checkForGenericFamilyChange(RenderStyle*, RenderStyle* parentStyle);
     void checkForZoomChange(RenderStyle*, RenderStyle* parentStyle);
 
     void adjustRenderStyle(RenderStyle* styleToAdjust, RenderStyle* parentStyle, Element*);
+    void adjustGridItemPosition(RenderStyle* styleToAdjust) const;
 
     bool fastRejectSelector(const RuleData&) const;
 
     void applyMatchedProperties(const MatchResult&, const Element*);
 
     enum StyleApplicationPass {
         VariableDefinitions,
         HighPriorityProperties,
         LowPriorityProperties
     };
@@ skipping 268 matching lines @@
         PseudoId ignoreDynamicPseudo = NOPSEUDO;
         if (selectorChecker.match(selectorCheckingContext, ignoreDynamicPseudo, DOMSiblingTraversalStrategy()) == SelectorChecker::SelectorMatches)
             return true;
     }
     return false;
 }
 
 } // namespace WebCore
 
 #endif // StyleResolver_h