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

third_party/WebKit/Source/core/css/CSSCalculationValue.cpp

Index: third_party/WebKit/Source/core/css/CSSCalculationValue.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSCalculationValue.cpp b/third_party/WebKit/Source/core/css/CSSCalculationValue.cpp
index c6d29834d2ac387dac658b661fc034dfb872b639..79b32c34aca76aecf4a22ae6373cf8763b747066 100644
--- a/third_party/WebKit/Source/core/css/CSSCalculationValue.cpp
+++ b/third_party/WebKit/Source/core/css/CSSCalculationValue.cpp
@@ -201,6 +201,9 @@ public:
     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;