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

Source/core/css/CSSParser.h

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 - 2010  Torch Mobile (Beijing) Co. Ltd. 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.
@@ skipping 141 matching lines @@
     PassRefPtr<CSSValue> parseAnimationProperty(AnimationParseContext&);
     PassRefPtr<CSSValue> parseAnimationTimingFunction();
 
     bool parseTransformOriginShorthand(RefPtr<CSSValue>&, RefPtr<CSSValue>&, RefPtr<CSSValue>&);
     bool parseCubicBezierTimingFunctionValue(CSSParserValueList*& args, double& result);
     bool parseAnimationProperty(CSSPropertyID, RefPtr<CSSValue>&, AnimationParseContext&);
     bool parseTransitionShorthand(CSSPropertyID, bool important);
     bool parseAnimationShorthand(bool important);
 
     bool cssGridLayoutEnabled() const;
+    PassRefPtr<CSSValue> parseGridPosition();
     bool parseGridItemPositionShorthand(CSSPropertyID, bool important);
     bool parseGridTrackList(CSSPropertyID, bool important);
     PassRefPtr<CSSPrimitiveValue> parseGridTrackSize();
     PassRefPtr<CSSPrimitiveValue> parseGridBreadth(CSSParserValue*);
 
     bool parseClipShape(CSSPropertyID, bool important);
 
     bool parseBasicShape(CSSPropertyID, bool important);
     PassRefPtr<CSSBasicShape> parseBasicShapeRectangle(CSSParserValueList* args);
     PassRefPtr<CSSBasicShape> parseBasicShapeCircle(CSSParserValueList* args);
@@ skipping 546 matching lines @@
 }
 
 inline int cssyylex(void* yylval, CSSParser* parser)
 {
     return parser->lex(yylval);
 }
 
 } // namespace WebCore
 
 #endif // CSSParser_h