Allow grid positions to be named grid areas

Source/core/css/CSSComputedStyleDeclaration.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ skipping 1054 matching lines @@
     // Those are the trailing <string>* allowed in the syntax.
     addValuesForNamedGridLinesAtIndex(namedGridLines, trackSizes.size(), *list);
     return list.release();
 }
 
 static PassRefPtr<CSSValue> valueForGridPosition(const GridPosition& position)
 {
     if (position.isAuto())
         return cssValuePool().createIdentifierValue(CSSValueAuto);
 
+    if (position.isNamedGridArea())
+        return cssValuePool().createValue(position.namedGridLine(), CSSPrimitiveValue::CSS_STRING);
+
     RefPtr<CSSValueList> list = CSSValueList::createSpaceSeparated();
     if (position.isSpan()) {
         list->append(cssValuePool().createIdentifierValue(CSSValueSpan));
         list->append(cssValuePool().createValue(position.spanPosition(), CSSPrimitiveValue::CSS_NUMBER));
     } else
         list->append(cssValuePool().createValue(position.integerPosition(), CSSPrimitiveValue::CSS_NUMBER));
 
     if (!position.namedGridLine().isNull())
         list->append(cssValuePool().createValue(position.namedGridLine(), CSSPrimitiveValue::CSS_STRING));
     return list;
@@ skipping 1984 matching lines @@
     static const CSSPropertyID propertiesAfterSlashSeperator[3] = { CSSPropertyBackgroundSize, CSSPropertyBackgroundOrigin,
                                                                     CSSPropertyBackgroundClip };
 
     RefPtr<CSSValueList> list = CSSValueList::createSlashSeparated();
     list->append(getCSSPropertyValuesForShorthandProperties(StylePropertyShorthand(CSSPropertyBackground, propertiesBeforeSlashSeperator, WTF_ARRAY_LENGTH(propertiesBeforeSlashSeperator))));
     list->append(getCSSPropertyValuesForShorthandProperties(StylePropertyShorthand(CSSPropertyBackground, propertiesAfterSlashSeperator, WTF_ARRAY_LENGTH(propertiesAfterSlashSeperator))));
     return list.release();
 }
 
 } // namespace WebCore