Fix behaviour of shadow interpolation with mismatched list lengths

third_party/WebKit/Source/core/animation/CSSLengthListInterpolationType.cpp

Index: third_party/WebKit/Source/core/animation/CSSLengthListInterpolationType.cpp
diff --git a/third_party/WebKit/Source/core/animation/CSSLengthListInterpolationType.cpp b/third_party/WebKit/Source/core/animation/CSSLengthListInterpolationType.cpp
index 36d4ca3be72e98bcc0ef5fd84e827e6d0afc3435..7d561772ef1de92a2bdb68c432a20ff88192d95c 100644
--- a/third_party/WebKit/Source/core/animation/CSSLengthListInterpolationType.cpp
+++ b/third_party/WebKit/Source/core/animation/CSSLengthListInterpolationType.cpp
@@ -124,6 +124,7 @@ PairwiseInterpolationValue CSSLengthListInterpolationType::MaybeMergeSingles(
     InterpolationValue&& end) const {
   return ListInterpolationFunctions::MaybeMergeSingles(
       std::move(start), std::move(end),
+      ListInterpolationFunctions::kLowestCommonMultiple,
       LengthInterpolationFunctions::MergeSingles);
 }
 
@@ -144,6 +145,7 @@ void CSSLengthListInterpolationType::Composite(
     double interpolation_fraction) const {
   ListInterpolationFunctions::Composite(
       underlying_value_owner, underlying_fraction, *this, value,
+      ListInterpolationFunctions::kLowestCommonMultiple,
       LengthInterpolationFunctions::NonInterpolableValuesAreCompatible,
       LengthInterpolationFunctions::Composite);
 }