[CSS Grid Layout] Update grid-auto-flow to the new syntax

Source/core/css/resolver/StyleBuilderCustom.cpp

Index: Source/core/css/resolver/StyleBuilderCustom.cpp
diff --git a/Source/core/css/resolver/StyleBuilderCustom.cpp b/Source/core/css/resolver/StyleBuilderCustom.cpp
index dab8db7c24c2110f0036006daf0946622ffc668e..264bdd4d282bdebad5307b13774d698cd8408392 100644
--- a/Source/core/css/resolver/StyleBuilderCustom.cpp
+++ b/Source/core/css/resolver/StyleBuilderCustom.cpp
@@ -1400,4 +1400,60 @@ void StyleBuilderFunctions::applyValueCSSPropertyBaselineShift(StyleResolverStat
     }
 }
 
+void StyleBuilderFunctions::applyValueCSSPropertyGridAutoFlow(StyleResolverState& state, CSSValue* value)
+{
+    ASSERT(value->isValueList());
+    CSSValueList* list = toCSSValueList(value);
+
+    CSSPrimitiveValue* first = list->length() >= 1 ? toCSSPrimitiveValue(list->item(0)) : nullptr;
+
+    if (!first) {
+        applyInitialCSSPropertyGridAutoFlow(state);
+        return;
+    }
+
+    CSSPrimitiveValue* second = list->length() == 2 ? toCSSPrimitiveValue(list->item(1)) : nullptr;
+
+    GridAutoFlow autoFlow = RenderStyle::initialGridAutoFlow();
+    switch (first->getValueID()) {
+    case CSSValueRow:
+        if (second) {
+            if (second->getValueID() == CSSValueDense)
+                autoFlow = AutoFlowRowDense;
+            else
+                autoFlow = AutoFlowStackRow;
+        } else {
+            autoFlow = AutoFlowRow;
+        }
+        break;
+    case CSSValueColumn:
+        if (second) {
+            if (second->getValueID() == CSSValueDense)
+                autoFlow = AutoFlowColumnDense;
+            else
+                autoFlow = AutoFlowStackColumn;
+        } else {
+            autoFlow = AutoFlowColumn;
+        }
+        break;
+    case CSSValueDense:
+        if (second && second->getValueID() == CSSValueColumn)
+            autoFlow = AutoFlowColumnDense;
+        else
+            autoFlow = AutoFlowRowDense;
+        break;
+    case CSSValueStack:
+        if (second && second->getValueID() == CSSValueColumn)
+            autoFlow = AutoFlowStackColumn;
+        else
+            autoFlow = AutoFlowStackRow;
+        break;
+    default:
+        ASSERT_NOT_REACHED();
+        break;
+    }
+
+    state.style()->setGridAutoFlow(autoFlow);
+}
+
 } // namespace WebCore