[CSS Grid Layout] Introduce an explicit type for resolved grid positions

Source/core/css/parser/CSSPropertyParser.cpp

Index: Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/Source/core/css/parser/CSSPropertyParser.cpp b/Source/core/css/parser/CSSPropertyParser.cpp
index 94d422a18e6f13550844a5e7674d558a295fc74c..d491d4df2c16640cb250a888cd32eba5c8d85b2d 100644
--- a/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/Source/core/css/parser/CSSPropertyParser.cpp
@@ -3863,18 +3863,18 @@ bool CSSPropertyParser::parseGridTemplateAreasRow(NamedGridAreaMap& gridAreaMap,
 
             // The following checks test that the grid area is a single filled-in rectangle.
             // 1. The new row is adjacent to the previously parsed row.
-            if (rowCount != gridCoordinate.rows.finalPositionIndex + 1)
+            if (rowCount != gridCoordinate.rows.resolvedFinalPosition.toInt() + 1)
                 return false;
 
             // 2. The new area starts at the same position as the previously parsed area.
-            if (currentCol != gridCoordinate.columns.initialPositionIndex)
+            if (currentCol != gridCoordinate.columns.resolvedInitialPosition.toInt())
                 return false;
 
             // 3. The new area ends at the same position as the previously parsed area.
-            if (lookAheadCol != gridCoordinate.columns.finalPositionIndex)
+            if (lookAheadCol != gridCoordinate.columns.resolvedFinalPosition.toInt())
                 return false;
 
-            ++gridCoordinate.rows.finalPositionIndex;
+            ++gridCoordinate.rows.resolvedFinalPosition;
         }
         currentCol = lookAheadCol;
     }