Re-land Catch up the spec update in CSS Rhythmic Sizing

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

Index: third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp b/third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp
index 62c37871077fca476ca893b13f85a1d9cf2a16f1..3107defc0508cb4672d8bd7781d349b42afdd4fb 100644
--- a/third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp
+++ b/third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp
@@ -300,6 +300,13 @@ unsigned short CSSPrimitiveValue::computeLength(
 }
 
 template <>
+uint8_t CSSPrimitiveValue::computeLength(
+    const CSSToLengthConversionData& conversionData) const {
+  return roundForImpreciseConversion<uint8_t>(
+      computeLengthDouble(conversionData));
+}
+
+template <>
 float CSSPrimitiveValue::computeLength(
     const CSSToLengthConversionData& conversionData) const {
   return clampTo<float>(computeLengthDouble(conversionData));