Web Animations API: Deferred computation of interpolated values

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 d52b0548cc6ffb2b6581de80c7660e306efe515a..20b2807dfa8efd6bbdf78ac0e83afc71a856f839 100644
--- a/Source/core/css/CSSPrimitiveValue.h
+++ b/Source/core/css/CSSPrimitiveValue.h
@@ -157,6 +157,7 @@ public:
     };
 
     typedef Vector<double, CSSPrimitiveValue::LengthUnitTypeCount> CSSLengthArray;
+    static void zeroLengthArray(CSSLengthArray&);
     void accumulateLengthArray(CSSLengthArray&, double multiplier = 1) const;
 
     // This enum follows the BisonCSSParser::Units enum augmented with UNIT_FREQUENCY for frequencies.
@@ -191,6 +192,7 @@ public:
             || m_primitiveUnitType == CSS_REMS
             || m_primitiveUnitType == CSS_CHS;
     }
+    bool isViewportPercentageLength() const { return isViewportPercentageLength(m_primitiveUnitType); }
     static bool isViewportPercentageLength(unsigned short type) { return type >= CSS_VW && type <= CSS_VMAX; }
     static bool isLength(unsigned short type)
     {