Use StyleBuilderConverter for text-decoration(-line).

Source/core/css/resolver/StyleBuilderConverter.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 28 matching lines @@
 namespace blink {
 
 // Note that we assume the parser only allows valid CSSValue types.
 
 class StyleBuilderConverter {
 public:
     static PassRefPtr<StyleReflection> convertBoxReflect(StyleResolverState&, CSSValue*);
     static AtomicString convertFragmentIdentifier(StyleResolverState&, CSSValue*);
     static Color convertColor(StyleResolverState&, CSSValue*, bool forVisitedLink = false);
     template <typename T> static T convertComputedLength(StyleResolverState&, CSSValue*);
+    template <typename T> static T convertFlags(StyleResolverState&, CSSValue*);
     static EGlyphOrientation convertGlyphOrientation(StyleResolverState&, CSSValue*);
     static GridPosition convertGridPosition(StyleResolverState&, CSSValue*);
     static GridTrackSize convertGridTrackSize(StyleResolverState&, CSSValue*);
     template <typename T> static T convertLineWidth(StyleResolverState&, CSSValue*);
     static Length convertLength(StyleResolverState&, CSSValue*);
     static Length convertLengthOrAuto(StyleResolverState&, CSSValue*);
     static Length convertLengthSizing(StyleResolverState&, CSSValue*);
     static Length convertLengthMaxSizing(StyleResolverState&, CSSValue*);
     static LengthPoint convertLengthPoint(StyleResolverState&, CSSValue*);
     static LineBoxContain convertLineBoxContain(StyleResolverState&, CSSValue*);
@@ skipping 13 matching lines @@
     static void createImplicitNamedGridLinesFromGridArea(const NamedGridAreaMap&, NamedGridLinesMap&, GridTrackSizingDirection);
 };
 
 template <typename T>
 T StyleBuilderConverter::convertComputedLength(StyleResolverState& state, CSSValue* value)
 {
     return toCSSPrimitiveValue(value)->computeLength<T>(state.cssToLengthConversionData());
 }
 
 template <typename T>
+T StyleBuilderConverter::convertFlags(StyleResolverState& state, CSSValue* value)
+{
+    T flags = static_cast<T>(0);
+    for (CSSValueListIterator i(value); i.hasMore(); i.advance())
+        flags |= *toCSSPrimitiveValue(i.value());
+    return flags;
+}
+
+template <typename T>
 T StyleBuilderConverter::convertLineWidth(StyleResolverState& state, CSSValue* value)
 {
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     CSSValueID valueID = primitiveValue->getValueID();
     if (valueID == CSSValueThin)
         return 1;
     if (valueID == CSSValueMedium)
         return 3;
     if (valueID == CSSValueThick)
         return 5;
@@ skipping 17 matching lines @@
 {
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     if (primitiveValue->getValueID() == IdForNone)
         return nullAtom;
     return AtomicString(primitiveValue->getStringValue());
 }
 
 } // namespace blink
 
 #endif