Rename maybeConvertUnderlyingValue() in CSSInterpolationType subclasses

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

Index: third_party/WebKit/Source/core/animation/CSSInterpolationType.cpp
diff --git a/third_party/WebKit/Source/core/animation/CSSInterpolationType.cpp b/third_party/WebKit/Source/core/animation/CSSInterpolationType.cpp
index 6785e24f15f416b33d0bf03bcca7c8c0ca8bc3d5..c784cebba06f25f30835b42dbad2efbce10e656e 100644
--- a/third_party/WebKit/Source/core/animation/CSSInterpolationType.cpp
+++ b/third_party/WebKit/Source/core/animation/CSSInterpolationType.cpp
@@ -89,6 +89,13 @@ InterpolationValue CSSInterpolationType::maybeConvertSingle(
   return maybeConvertValue(*value, environment.state(), conversionCheckers);
 }
 
+InterpolationValue CSSInterpolationType::maybeConvertUnderlyingValue(
+    const InterpolationEnvironment& environment) const {
+  // TODO(alancutter): Add support for converting underlying registered custom
+  // property values.
+  return maybeConvertStandardPropertyUnderlyingValue(environment.state());
+}
+
 void CSSInterpolationType::apply(
     const InterpolableValue& interpolableValue,
     const NonInterpolableValue* nonInterpolableValue,