Move viewport unit resolution to style recalc time

Source/core/css/CSSPrimitiveValue.h

Index: Source/core/css/CSSPrimitiveValue.h
diff --git a/Source/core/css/CSSPrimitiveValue.h b/Source/core/css/CSSPrimitiveValue.h
index 65b1cfbf66fc01fc790977fe852e49e9d5570b7e..0316b94a591e69c814a328a6f68d0039bf4398e7 100644
--- a/Source/core/css/CSSPrimitiveValue.h
+++ b/Source/core/css/CSSPrimitiveValue.h
@@ -144,7 +144,6 @@ public:
         UAngle,
         UTime,
         UFrequency,
-        UViewportPercentageLength,
         UResolution,
         UOther
     };
@@ -170,7 +169,7 @@ public:
     bool isLength() const
     {
         unsigned short type = primitiveType();
-        return (type >= CSS_EMS && type <= CSS_PC) || type == CSS_REMS || type == CSS_CHS;
+        return (type >= CSS_EMS && type <= CSS_PC) || type == CSS_REMS || type == CSS_CHS || isViewportPercentageLength();
     }
     bool isNumber() const { return primitiveType() == CSS_NUMBER; }
     bool isPercentage() const { return primitiveType() == CSS_PERCENTAGE; }
@@ -315,8 +314,6 @@ public:
 
     void addSubresourceStyleURLs(ListHashSet<KURL>&, const StyleSheetContents*) const;
 
-    Length viewportPercentageLength();
-
     PassRefPtr<CSSPrimitiveValue> cloneForCSSOM() const;
     void setCSSOMSafe() { m_isCSSOMSafe = true; }