InterpolationValue CSSImageInterpolationType::maybeConvertNeutral(
    const InterpolationValue& underlying,
    ConversionCheckers& conversionCheckers) const {
  conversionCheckers.append(UnderlyingImageChecker::create(underlying));
  return InterpolationValue(underlying.clone());
}
 UnderlyingImageChecker(const InterpolationValue& underlying)
     : m_underlying(underlying.clone()) {}