Move the grid-gap shorthand into CSSPropertyParser

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 76d2b2e12478df10c3c2f422c9d1573a7ee38b43..8e09fb9eb4cbcd981eadb3519362be1faa25a83e 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
@@ -4874,6 +4874,18 @@ bool CSSPropertyParser::parseShorthand(CSSPropertyID unresolvedProperty, bool im
         return consumeBackgroundShorthand(backgroundShorthand(), important);
     case CSSPropertyWebkitMask:
         return consumeBackgroundShorthand(webkitMaskShorthand(), important);
+    case CSSPropertyGridGap: {
+        ASSERT(RuntimeEnabledFeatures::cssGridLayoutEnabled() && shorthandForProperty(CSSPropertyGridGap).length() == 2);
+        RefPtrWillBeRawPtr<CSSValue> rowGap = consumeLength(m_range, m_context.mode(), ValueRangeNonNegative);
+        RefPtrWillBeRawPtr<CSSValue> columnGap = consumeLength(m_range, m_context.mode(), ValueRangeNonNegative);
+        if (!rowGap || !m_range.atEnd())
+            return false;
+        if (!columnGap)
+            columnGap = rowGap;
+        addProperty(CSSPropertyGridRowGap, rowGap.release(), important);
+        addProperty(CSSPropertyGridColumnGap, columnGap.release(), important);
+        return true;
+    }
     default:
         m_currentShorthand = oldShorthand;
         CSSParserValueList valueList(m_range);