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

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 1035 matching lines @@
     for (size_t i = 0; i < trackSizes.size(); ++i)
         list->append(valueForGridTrackSize(trackSizes[i], style, renderView));
     return list.release();
 }
 
 static PassRefPtr<CSSValue> valueForGridPosition(const GridPosition& position)
 {
     if (position.isAuto())
         return cssValuePool().createIdentifierValue(CSSValueAuto);
 
-    return cssValuePool().createValue(position.integerPosition(), CSSPrimitiveValue::CSS_NUMBER);
+    if (position.isInteger())
+        return cssValuePool().createValue(position.integerPosition(), CSSPrimitiveValue::CSS_NUMBER);
+
+    RefPtr<CSSValueList> list = CSSValueList::createSpaceSeparated();
+    list->append(cssValuePool().createIdentifierValue(CSSValueSpan));
+    list->append(cssValuePool().createValue(position.spanPosition(), CSSPrimitiveValue::CSS_NUMBER));
+    return list;
 }
 static PassRefPtr<CSSValue> createTransitionPropertyValue(const Animation* animation)
 {
     RefPtr<CSSValue> propertyValue;
     if (animation->animationMode() == Animation::AnimateNone)
         propertyValue = cssValuePool().createIdentifierValue(CSSValueNone);
     else if (animation->animationMode() == Animation::AnimateAll)
         propertyValue = cssValuePool().createIdentifierValue(CSSValueAll);
     else
         propertyValue = cssValuePool().createValue(getPropertyNameString(animation->property()), CSSPrimitiveValue::CSS_STRING);
@@ skipping 1942 matching lines @@
     static const CSSPropertyID propertiesAfterSlashSeperator[3] = { CSSPropertyBackgroundSize, CSSPropertyBackgroundOrigin, 
                                                                     CSSPropertyBackgroundClip };
 
     RefPtr<CSSValueList> list = CSSValueList::createSlashSeparated();
     list->append(getCSSPropertyValuesForShorthandProperties(StylePropertyShorthand(propertiesBeforeSlashSeperator, WTF_ARRAY_LENGTH(propertiesBeforeSlashSeperator))));
     list->append(getCSSPropertyValuesForShorthandProperties(StylePropertyShorthand(propertiesAfterSlashSeperator, WTF_ARRAY_LENGTH(propertiesAfterSlashSeperator))));
     return list.release();
 }
 
 } // namespace WebCore