CSS Calc: Use Lengths instead of numbers to represent pixels

Source/core/css/CSSCalculationValue.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 212 matching lines @@
     {
         return m_value->isVariableName();
     }
 
     virtual PassOwnPtr<CalcExpressionNode> toCalcValue(const RenderStyle* style, const RenderStyle* rootStyle, double zoom) const
     {
         switch (m_category) {
         case CalcNumber:
             return adoptPtr(new CalcExpressionNumber(m_value->getFloatValue()));
         case CalcLength:
-            return adoptPtr(new CalcExpressionNumber(m_value->computeLength<float>(style, rootStyle, zoom)));
+            return adoptPtr(new CalcExpressionLength(Length(m_value->computeLength<float>(style, rootStyle, zoom), WebCore::Fixed)));
         case CalcPercent:
         case CalcPercentLength: {
             CSSPrimitiveValue* primitiveValue = m_value.get();
             return adoptPtr(new CalcExpressionLength(primitiveValue
                 ? primitiveValue->convertToLength<FixedFloatConversion | PercentConversion | FractionConversion>(style, rootStyle, zoom)
                 : Length(Undefined)));
         }
         // Only types that could be part of a Length expression can be converted
         // to a CalcExpressionNode. CalcPercentNumber makes no sense as a Length.
         case CalcPercentNumber:
@@ skipping 540 matching lines @@
 
     return expression ? adoptRef(new CSSCalcValue(expression, range)) : 0;
 }
 
 PassRefPtr<CSSCalcValue> CSSCalcValue::create(PassRefPtr<CSSCalcExpressionNode> expression, CalculationPermittedValueRange range)
 {
     return adoptRef(new CSSCalcValue(expression, range));
 }
 
 } // namespace WebCore