Split out Attribute from CSSPrimitiveValue

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 2249 matching lines @@
     String attrName = a->string;
     // CSS allows identifiers with "-" at the start, like "-webkit-mask-image".
     // But HTML attribute names can't have those characters, and we should not
     // even parse them inside attr().
     if (attrName[0] == '-')
         return nullptr;
 
     if (m_context.isHTMLDocument())
         attrName = attrName.lower();
 
-    return cssValuePool().createValue(attrName, CSSPrimitiveValue::UnitType::Attribute);
+    RefPtrWillBeRawPtr<CSSFunctionValue> attrValue = CSSFunctionValue::create(CSSValueAttr);
+    attrValue->append(CSSPrimitiveValue::create(attrName, CSSPrimitiveValue::UnitType::CustomIdentifier));
+    return attrValue.release();
 }
 
 bool CSSPropertyParser::acceptQuirkyColors(CSSPropertyID propertyId) const
 {
     if (!inQuirksMode())
         return false;
     switch (propertyId) {
     case CSSPropertyBackgroundColor:
     case CSSPropertyBorderBottomColor:
     case CSSPropertyBorderLeftColor:
@@ skipping 5811 matching lines @@
         }
     }
 
     if (!list->length())
         return nullptr;
 
     return list.release();
 }
 
 } // namespace blink