Implement parseShorthand API for shorthand properties, "overflow", "font" and "font-variant"

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CSSPropertyParserHelpers_h
 #define CSSPropertyParserHelpers_h
 
 #include "core/css/CSSCustomIdentValue.h"
 #include "core/css/CSSIdentifierValue.h"
 #include "core/css/CSSPrimitiveValue.h"
@@ skipping 93 matching lines @@
 CSSValue* ConsumeImage(
     CSSParserTokenRange&,
     const CSSParserContext*,
     ConsumeGeneratedImagePolicy = ConsumeGeneratedImagePolicy::kAllow);
 CSSValue* ConsumeImageOrNone(CSSParserTokenRange&, const CSSParserContext*);
 
 bool IsCSSWideKeyword(StringView);
 
 CSSIdentifierValue* ConsumeShapeBox(CSSParserTokenRange&);
 
+enum class ImplicitProperty { kNotImplicit, kImplicit };

[alancutter (OOO until 2018), 2017/06/20 01:50:44]

Minor bikeshed: Maybe rename as IsImplicitProperty for clarity that it's
representing a boolean state?

[Jia, 2017/06/20 03:29:45]

Done.

+
 void AddProperty(CSSPropertyID resolved_property,
                  CSSPropertyID current_shorthand,
                  const CSSValue&,
                  bool important,
-                 bool implicit,
+                 ImplicitProperty,
                  HeapVector<CSSProperty, 256>& properties);
 
 // Template implementations are at the bottom of the file for readability.
 
 template <typename... emptyBaseCase>
 inline bool IdentMatches(CSSValueID id) {
   return false;
 }
 template <CSSValueID head, CSSValueID... tail>
 inline bool IdentMatches(CSSValueID id) {
@@ skipping 24 matching lines @@
   } while (ConsumeCommaIncludingWhitespace(range));
   DCHECK(list->length());
   return list;
 }
 
 }  // namespace CSSPropertyParserHelpers
 
 }  // namespace blink
 
 #endif  // CSSPropertyParserHelpers_h