Web Animations API: Deferred computation of interpolated values

Source/core/css/CSSPrimitiveValue.cpp

Index: Source/core/css/CSSPrimitiveValue.cpp
diff --git a/Source/core/css/CSSPrimitiveValue.cpp b/Source/core/css/CSSPrimitiveValue.cpp
index 2bcc42bbe9b52a07783c120e21552ae3d666c50f..d84a33c8d2a616c83a4cc76dbc0d9ad148392e12 100644
--- a/Source/core/css/CSSPrimitiveValue.cpp
+++ b/Source/core/css/CSSPrimitiveValue.cpp
@@ -697,6 +697,13 @@ double CSSPrimitiveValue::computeLengthDouble(const CSSToLengthConversionData& c
     return result * conversionData.zoom();
 }
 
+void CSSPrimitiveValue::zeroLengthArray(CSSLengthArray& lengthArray)
+{
+    lengthArray.resize(LengthUnitTypeCount);
+    for (size_t i = 0; i < LengthUnitTypeCount; ++i)
+        lengthArray.at(i) = 0;
+}
+
 void CSSPrimitiveValue::accumulateLengthArray(CSSLengthArray& lengthArray, double multiplier) const
 {
     ASSERT(lengthArray.size() == LengthUnitTypeCount);