[CSS Grid Layout] ASSERTION: !value || (value->isGridLineNamesValue())

Source/core/css/parser/CSSPropertyParser.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 3268 matching lines @@
         // Handle leading <custom-ident>*.
         if (!parseGridLineNames(*m_valueList, *templateRows, trailingIdentWasAdded ? toCSSGridLineNamesValue(templateRows->item(templateRows->length() - 1)) : nullptr))
             return false;
 
         // Handle a template-area's row.
         if (!parseGridTemplateAreasRow(gridAreaMap, rowCount, columnCount))
             return false;
         ++rowCount;
 
         // Handle template-rows's track-size.
-        if (m_valueList->current() && m_valueList->current()->unit != CSSParserValue::ValueList && m_valueList->current()->unit != CSSPrimitiveValue::CSS_STRING) {
+        if (m_valueList->current() && m_valueList->current()->unit != CSSPrimitiveValue::CSS_STRING) {
             RefPtrWillBeRawPtr<CSSValue> value = parseGridTrackSize(*m_valueList);
             if (!value)
                 return false;
             templateRows->append(value);
         } else {
             templateRows->append(cssValuePool().createIdentifierValue(CSSValueAuto));
         }
 
         // This will handle the trailing/leading <custom-ident>* in the grammar.
-        const CSSParserValue* current = m_valueList->current();
-        trailingIdentWasAdded = current && current->unit == CSSParserValue::ValueList && current->valueList->size() > 0;
         if (!parseGridLineNames(*m_valueList, *templateRows))
             return false;
+        trailingIdentWasAdded = templateRows->item(templateRows->length() - 1)->isGridLineNamesValue();
     }
 
     // [<track-list> /]?
     if (templateColumns)
         addProperty(CSSPropertyGridTemplateColumns, templateColumns, important);
     else
         addProperty(CSSPropertyGridTemplateColumns,  cssValuePool().createIdentifierValue(CSSValueNone), important);
 
     // [<line-names>? <string> [<track-size> <line-names>]? ]+
     RefPtrWillBeRawPtr<CSSValue> templateAreas = CSSGridTemplateAreasValue::create(gridAreaMap, rowCount, columnCount);
@@ skipping 5164 matching lines @@
         }
     }
 
     if (!list->length())
         return nullptr;
 
     return list.release();
 }
 
 } // namespace blink