Add support to resolve unprefixed CSS animations properties.

Source/core/scripts/templates/StylePropertyShorthand.h.tmpl

Index: Source/core/scripts/templates/StylePropertyShorthand.h.tmpl
diff --git a/Source/core/scripts/templates/StylePropertyShorthand.h.tmpl b/Source/core/scripts/templates/StylePropertyShorthand.h.tmpl
index 2bf03820d62c30e9cf012d7f20d4efacb1db226a..5ef9febce3746470be46774e5994f71ea0f2ff18 100644
--- a/Source/core/scripts/templates/StylePropertyShorthand.h.tmpl
+++ b/Source/core/scripts/templates/StylePropertyShorthand.h.tmpl
@@ -70,8 +70,9 @@ private:
 {%- set camel_case_name = property.camel_case_name %}
 const StylePropertyShorthand& {{ camel_case_name }}Shorthand();
 {%- endfor %}
-const StylePropertyShorthand& borderShorthandForParsing();
-const StylePropertyShorthand& webkitAnimationShorthandForParsing();
+
+// Returns an empty list if the property is not a shorthand, otherwise the list of longhands for parsing.
+const StylePropertyShorthand& parsingShorthandForProperty(CSSPropertyID);
 
 // Returns an empty list if the property is not a shorthand.
 const StylePropertyShorthand& shorthandForProperty(CSSPropertyID);