SVG doesn't recognize ch units.

Source/core/css/parser/CSSPropertyParser.cpp

Index: Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/Source/core/css/parser/CSSPropertyParser.cpp b/Source/core/css/parser/CSSPropertyParser.cpp
index 02e08bccad29329181b1725652d0b9ec9639d999..3ae22ff9a7275f3a909dab511baf344bdfdb0c3f 100644
--- a/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/Source/core/css/parser/CSSPropertyParser.cpp
@@ -8145,7 +8145,7 @@ bool CSSPropertyParser::parseSVGValue(CSSPropertyID propId, bool important)
             parsedValue = CSSPrimitiveValue::create(value->string, (CSSPrimitiveValue::UnitType) value->unit);
         else if (value->unit >= CSSPrimitiveValue::CSS_NUMBER && value->unit <= CSSPrimitiveValue::CSS_KHZ)
             parsedValue = CSSPrimitiveValue::create(value->fValue, (CSSPrimitiveValue::UnitType) value->unit);
-        else if (value->unit == CSSPrimitiveValue::CSS_REMS)
+        else if (value->unit == CSSPrimitiveValue::CSS_REMS || value->unit == CSSPrimitiveValue::CSS_CHS)
             parsedValue = CSSPrimitiveValue::create(value->fValue, (CSSPrimitiveValue::UnitType)value->unit);
         else if (value->unit >= CSSParserValue::Q_EMS)
             parsedValue = CSSPrimitiveValue::createAllowingMarginQuirk(value->fValue, CSSPrimitiveValue::CSS_EMS);
@@ -8177,7 +8177,7 @@ PassRefPtrWillBeRawPtr<CSSValue> CSSPropertyParser::parseSVGStrokeDasharray()
             ret->append(CSSPrimitiveValue::createIdentifier(value->id));
         else if (value->unit >= CSSPrimitiveValue::CSS_NUMBER && value->unit <= CSSPrimitiveValue::CSS_KHZ)
             ret->append(CSSPrimitiveValue::create(value->fValue, (CSSPrimitiveValue::UnitType) value->unit));
-        else if (value->unit == CSSPrimitiveValue::CSS_REMS)
+        else if (value->unit == CSSPrimitiveValue::CSS_REMS || value->unit == CSSPrimitiveValue::CSS_CHS)
             ret->append(CSSPrimitiveValue::create(value->fValue, (CSSPrimitiveValue::UnitType)value->unit));
         value = m_valueList->next();
         bool commaConsumed = consumeComma(m_valueList);