Allow number-percentage calc() in border-image-slice

third_party/WebKit/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 183 matching lines @@
     }
 
     String customCSSText() const override
     {
         return m_value->cssText();
     }
 
     void accumulatePixelsAndPercent(const CSSToLengthConversionData& conversionData, PixelsAndPercent& value, float multiplier) const override
     {
         switch (m_category) {
+        case CalcNumber:
+            value.pixels += m_value->getFloatValue() * multiplier;
+            break;

[alancutter (OOO until 2018), 2016/03/30 01:14:01]

Numbers aren't always converted straight to pixels in CSS, it would be better to
avoid adding this.

In terms of unit type sanity it's probably better to stop using Lengths on
ComputedStyle for border slices and instead make a PercentNumber data type.
+timloh WDYT?

         case CalcLength:
             value.pixels += m_value->computeLength<float>(conversionData) * multiplier;
             break;
         case CalcPercent:
             ASSERT(m_value->isPercentage());
             value.percent += m_value->getDoubleValue() * multiplier;
             break;
         default:
             ASSERT_NOT_REACHED();
         }
@@ skipping 523 matching lines @@
 
     return expression ? adoptRefWillBeNoop(new CSSCalcValue(expression, range)) : nullptr;
 }
 
 PassRefPtrWillBeRawPtr<CSSCalcValue> CSSCalcValue::create(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> expression, ValueRange range)
 {
     return adoptRefWillBeNoop(new CSSCalcValue(expression, range));
 }
 
 } // namespace blink