Add CSSInterpolationType specific ConversionChecker

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

Index: third_party/WebKit/Source/core/animation/CSSFontVariationSettingsInterpolationType.cpp
diff --git a/third_party/WebKit/Source/core/animation/CSSFontVariationSettingsInterpolationType.cpp b/third_party/WebKit/Source/core/animation/CSSFontVariationSettingsInterpolationType.cpp
index e7b258b0559703265c4a9569dfda8711e1d2b707..a69d3edf9cbd4f5cc31106bda1d99755ab397405 100644
--- a/third_party/WebKit/Source/core/animation/CSSFontVariationSettingsInterpolationType.cpp
+++ b/third_party/WebKit/Source/core/animation/CSSFontVariationSettingsInterpolationType.cpp
@@ -70,7 +70,7 @@ class UnderlyingTagsChecker : public InterpolationType::ConversionChecker {
 };
 
 class InheritedFontVariationSettingsChecker
-    : public InterpolationType::ConversionChecker {
+    : public CSSInterpolationType::CSSConversionChecker {
  public:
   ~InheritedFontVariationSettingsChecker() final {}
 
@@ -83,12 +83,11 @@ class InheritedFontVariationSettingsChecker
   InheritedFontVariationSettingsChecker(const FontVariationSettings* settings)
       : settings_(settings) {}
 
-  bool IsValid(const InterpolationEnvironment& environment,
+  bool IsValid(const StyleResolverState& state,
                const InterpolationValue&) const final {
-    return DataEquivalent(settings_.Get(), environment.GetState()
-                                               .ParentStyle()
-                                               ->GetFontDescription()
-                                               .VariationSettings());
+    return DataEquivalent(
+        settings_.Get(),
+        state.ParentStyle()->GetFontDescription().VariationSettings());
   }
 
   RefPtr<const FontVariationSettings> settings_;