Added support of calc() for SVGLength

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

Index: third_party/WebKit/Source/core/css/CSSCalculationValue.h
diff --git a/third_party/WebKit/Source/core/css/CSSCalculationValue.h b/third_party/WebKit/Source/core/css/CSSCalculationValue.h
index c4957c38f3afc4941d6203a05a20e772ab83e130..5c0332ff99bb3a596f7a4c0015bfcf61205e967c 100644
--- a/third_party/WebKit/Source/core/css/CSSCalculationValue.h
+++ b/third_party/WebKit/Source/core/css/CSSCalculationValue.h
@@ -60,6 +60,8 @@ enum CalculationCategory {
     CalcAngle,
     CalcTime,
     CalcFrequency,
+    CalcLengthNumber,

[rwlbuis, 2016/06/27 18:00:01]

Are you sure you need this one? The Number should default to 'px' so it
basically is a Length too AFAICS.

[Shanmuga Pandi, 2016/06/28 05:15:01]

I think it is needed. for eg. calc(10 + 20px). In this 10 is parsed as
CalcNumber and 20px is parsed as CalcLength. So the result category will be
CalcLengthNumber. CalcLengthNumber should be valid only for SVG. So we need to
have unique category to identfiy.

+    CalcPercentLengthNumber,
     CalcOther
 };