Add support for CSS3 "text-decoration" shorthand

Source/core/css/CSSComputedStyleDeclaration.cpp

Index: Source/core/css/CSSComputedStyleDeclaration.cpp
diff --git a/Source/core/css/CSSComputedStyleDeclaration.cpp b/Source/core/css/CSSComputedStyleDeclaration.cpp
index 44b0c319e091e2411f67521121e63ecec47e40c8..71d75fc092da01c24680fff3ecf7161177cdf815 100644
--- a/Source/core/css/CSSComputedStyleDeclaration.cpp
+++ b/Source/core/css/CSSComputedStyleDeclaration.cpp
@@ -2128,6 +2128,7 @@ PassRefPtr<CSSValue> CSSComputedStyleDeclaration::getPropertyCSSValue(CSSPropert
         case CSSPropertyTextAlign:
             return cssValuePool().createValue(style->textAlign());
         case CSSPropertyTextDecoration:
+            return getTextDecorationShorthandValue();
         case CSSPropertyTextDecorationLine:
             return renderTextDecorationFlagsToCSSValue(style->textDecoration());
         case CSSPropertyTextDecorationStyle:
@@ -2990,4 +2991,13 @@ PassRefPtr<CSSValueList> CSSComputedStyleDeclaration::getBackgroundShorthandValu
     return list.release();
 }
 
+PassRefPtr<CSSValueList> CSSComputedStyleDeclaration::getTextDecorationShorthandValue() const
+{
+    static const CSSPropertyID properties[3] = { CSSPropertyTextDecorationLine, CSSPropertyTextDecorationStyle, CSSPropertyTextDecorationColor };
+
+    RefPtr<CSSValueList> list = CSSValueList::createSpaceSeparated();
+    list->append(getCSSPropertyValuesForShorthandProperties(StylePropertyShorthand(CSSPropertyTextDecoration, properties, WTF_ARRAY_LENGTH(properties))));
+    return list.release();
+}
+
 } // namespace WebCore