CSS: Use count position values with 3 parts

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

Index: third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.h
diff --git a/third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.h b/third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.h
index e1f2a5f6a246ddc69af242a03f058341d0602292..6c4fa6bfb2b0c64504dfee0b9d31c209bdb3a765 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.h
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.h
@@ -37,6 +37,16 @@ CSSParserTokenRange ConsumeFunction(CSSParserTokenRange&);
 
 enum class UnitlessQuirk { kAllow, kForbid };
 
+enum class PositionSyntax {
+  kBackground,
+  kScrollSnapPoints,
+  kBasicShape,
+  kGradient,
+  kObjectPosition,
+  kPerspectiveOrigin,
+  kCurrent
+};
+
 CSSPrimitiveValue* ConsumeInteger(
     CSSParserTokenRange&,
     double minimum_value = -std::numeric_limits<double>::max());
@@ -78,11 +88,13 @@ CSSValue* ConsumeColor(CSSParserTokenRange&,
 CSSValue* ConsumeLineWidth(CSSParserTokenRange&, CSSParserMode, UnitlessQuirk);
 
 CSSValuePair* ConsumePosition(CSSParserTokenRange&,
-                              CSSParserMode,
-                              UnitlessQuirk);
+                              const CSSParserContext&,
+                              UnitlessQuirk,
+                              PositionSyntax);
 bool ConsumePosition(CSSParserTokenRange&,
-                     CSSParserMode,
+                     const CSSParserContext&,
                      UnitlessQuirk,
+                     PositionSyntax,
                      CSSValue*& result_x,
                      CSSValue*& result_y);
 bool ConsumeOneOrTwoValuedPosition(CSSParserTokenRange&,