Add smooth interpolation support for <color> custom properties

third_party/WebKit/Source/core/css/PropertyRegistration.cpp

Index: third_party/WebKit/Source/core/css/PropertyRegistration.cpp
diff --git a/third_party/WebKit/Source/core/css/PropertyRegistration.cpp b/third_party/WebKit/Source/core/css/PropertyRegistration.cpp
index 5b7ee3b3d773e6b121fcd70207e40ca54819ae73..9b6ce0bb670d9941912d8b23a36899cae2674e5e 100644
--- a/third_party/WebKit/Source/core/css/PropertyRegistration.cpp
+++ b/third_party/WebKit/Source/core/css/PropertyRegistration.cpp
@@ -4,7 +4,6 @@
 
 #include "core/css/PropertyRegistration.h"
 
-#include "core/animation/CSSValueInterpolationType.h"
 #include "core/css/CSSSyntaxDescriptor.h"
 #include "core/css/CSSValueList.h"
 #include "core/css/CSSVariableReferenceValue.h"
@@ -57,17 +56,6 @@ static bool computationallyIndependent(const CSSValue& value) {
   return true;
 }
 
-InterpolationTypes interpolationTypesForSyntax(const AtomicString& propertyName,
-                                               const CSSSyntaxDescriptor&) {
-  PropertyHandle property(propertyName);
-  InterpolationTypes interpolationTypes;
-  // TODO(alancutter): Read the syntax descriptor and add the appropriate
-  // CSSInterpolationType subclasses.
-  interpolationTypes.append(
-      WTF::makeUnique<CSSValueInterpolationType>(property));
-  return interpolationTypes;
-}
-
 void PropertyRegistration::registerProperty(
     ExecutionContext* executionContext,
     const PropertyDescriptor& descriptor,
@@ -102,7 +90,7 @@ void PropertyRegistration::registerProperty(
   }
 
   InterpolationTypes interpolationTypes =
-      interpolationTypesForSyntax(atomicName, syntaxDescriptor);
+      syntaxDescriptor.createInterpolationTypes(atomicName);
 
   if (descriptor.hasInitialValue()) {
     CSSTokenizer tokenizer(descriptor.initialValue());