CSS: Use count position values with 3 parts

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIScrollSnapCoordinate.cpp

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyAPIScrollSnapCoordinate.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIScrollSnapCoordinate.cpp b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIScrollSnapCoordinate.cpp
index 9be720bec71987ce1919d41a20ade40c1c721fce..bccc4159e696365de8cc50f2498d66f411906bbb 100644
--- a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIScrollSnapCoordinate.cpp
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIScrollSnapCoordinate.cpp
@@ -9,15 +9,18 @@
 #include "core/css/parser/CSSParserContext.h"
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 
+// TODO(crbug.com/724912): Retire scroll-snap-coordinate
+
 namespace blink {
 
 static CSSValueList* ConsumePositionList(CSSParserTokenRange& range,
-                                         CSSParserMode css_parser_mode) {
+                                         const CSSParserContext& context) {
   CSSValueList* positions = CSSValueList::CreateCommaSeparated();
   do {
-    CSSValue* position =
-        ConsumePosition(range, css_parser_mode,
-                        CSSPropertyParserHelpers::UnitlessQuirk::kForbid);
+    auto syntax = CSSPropertyParserHelpers::PositionSyntax::kPermitThreeValues;
+    CSSValue* position = ConsumePosition(
+        range, context, CSSPropertyParserHelpers::UnitlessQuirk::kForbid,
+        syntax);
     if (!position)
       return nullptr;
     positions->Append(*position);
@@ -31,7 +34,7 @@ const CSSValue* CSSPropertyAPIScrollSnapCoordinate::parseSingleValue(
     CSSPropertyID) {
   if (range.Peek().Id() == CSSValueNone)
     return CSSPropertyParserHelpers::ConsumeIdent(range);
-  return ConsumePositionList(range, context.Mode());
+  return ConsumePositionList(range, context);
 }
 
 }  // namespace blink