Proof of concept that CSSPropertyAPI*::parseSingleValue may need more tahn 2 arguments

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

Index: third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
index c35a2c59477b1f00a9c604cac18de34a1754e462..dc4585ec2d8eb7d41388945b0b271a37deb2f929 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
@@ -1636,22 +1636,6 @@ static CSSValue* consumeImageOrientation(CSSParserTokenRange& range) {
   return nullptr;
 }
 
-static CSSValue* consumeCommaSeparatedBackgroundComponent(
-    CSSPropertyID unresolvedProperty,
-    CSSParserTokenRange& range,
-    const CSSParserContext* context) {
-  CSSValue* result = nullptr;
-  do {
-    CSSValue* value =
-        CSSPropertyBackgroundComponentUtils::consumeBackgroundComponent(
-            unresolvedProperty, range, context);
-    if (!value)
-      return nullptr;
-    CSSPropertyBackgroundComponentUtils::addBackgroundValue(result, value);
-  } while (consumeCommaIncludingWhitespace(range));
-  return result;
-}
-
 static CSSValue* consumeAlignItems(CSSParserTokenRange& range) {
   // align-items property does not allow the 'auto' value.
   if (identMatches<CSSValueAuto>(range.peek().id()))
@@ -2428,26 +2412,6 @@ const CSSValue* CSSPropertyParser::parseSingleValue(
     case CSSPropertyImageOrientation:
       ASSERT(RuntimeEnabledFeatures::imageOrientationEnabled());
       return consumeImageOrientation(m_range);
-    case CSSPropertyBackgroundAttachment:
-    case CSSPropertyBackgroundBlendMode:
-    case CSSPropertyBackgroundClip:
-    case CSSPropertyBackgroundImage:
-    case CSSPropertyBackgroundOrigin:
-    case CSSPropertyBackgroundPositionX:
-    case CSSPropertyBackgroundPositionY:
-    case CSSPropertyBackgroundSize:
-    case CSSPropertyMaskSourceType:
-    case CSSPropertyWebkitBackgroundClip:
-    case CSSPropertyWebkitBackgroundOrigin:
-    case CSSPropertyWebkitMaskClip:
-    case CSSPropertyWebkitMaskComposite:
-    case CSSPropertyWebkitMaskImage:
-    case CSSPropertyWebkitMaskOrigin:
-    case CSSPropertyWebkitMaskPositionX:
-    case CSSPropertyWebkitMaskPositionY:
-    case CSSPropertyWebkitMaskSize:
-      return consumeCommaSeparatedBackgroundComponent(unresolvedProperty,
-                                                      m_range, m_context);
     case CSSPropertyWebkitMaskRepeatX:
     case CSSPropertyWebkitMaskRepeatY:
       return nullptr;