Implement ConsumeShorthandViaLonghand to parse shorthand by calling longhand ParseSingleValue

third_party/WebKit/Source/core/css/parser/CSSPropertyParser.h

Index: third_party/WebKit/Source/core/css/parser/CSSPropertyParser.h
diff --git a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.h b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.h
index 006910e38d157945232d367f114a4e31df3269f1..8022273756160648a53193b8a0a576217cdf0ddc 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.h
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.h
@@ -88,6 +88,12 @@ class CSSPropertyParser {
   bool Consume2Values(const StylePropertyShorthand&, bool important);
   bool Consume4Values(const StylePropertyShorthand&, bool important);
 
+  enum class LonghandsOrder { kNoOrder, kOrderBy2Values, kOrderBy4Values };
+
+  bool ConsumeShorthandViaLonghand(const StylePropertyShorthand&,
+                                   bool important,
+                                   LonghandsOrder);
+
   // Legacy parsing allows <string>s for animation-name
   bool ConsumeAnimationShorthand(const StylePropertyShorthand&,
                                  bool use_legacy_parsing,