[css-align] Implement place-items alignment shorthand

third_party/WebKit/Source/core/css/StylePropertySerializer.cpp

Index: third_party/WebKit/Source/core/css/StylePropertySerializer.cpp
diff --git a/third_party/WebKit/Source/core/css/StylePropertySerializer.cpp b/third_party/WebKit/Source/core/css/StylePropertySerializer.cpp
index 7ad9a76e274473036db60f48f2e50bce9d99de11..229aa9253e3dd33f7ad25875bd75d734b1008f0a 100644
--- a/third_party/WebKit/Source/core/css/StylePropertySerializer.cpp
+++ b/third_party/WebKit/Source/core/css/StylePropertySerializer.cpp
@@ -455,7 +455,9 @@ String StylePropertySerializer::getPropertyValue(
     case CSSPropertyGridGap:
       return getShorthandValue(gridGapShorthand());
     case CSSPropertyPlaceContent:
-      return placeContentPropertyValue();
+      return getAlignmentShorthandValue(placeContentShorthand());
+    case CSSPropertyPlaceItems:
+      return getAlignmentShorthandValue(placeItemsShorthand());
     case CSSPropertyFont:
       return fontValue();
     case CSSPropertyFontVariant:
@@ -850,10 +852,11 @@ String StylePropertySerializer::getCommonValue(
   return res;
 }
 
-String StylePropertySerializer::placeContentPropertyValue() const {
-  String value = getCommonValue(placeContentShorthand());
+String StylePropertySerializer::getAlignmentShorthandValue(
+    const StylePropertyShorthand& shorthand) const {
+  String value = getCommonValue(shorthand);
   if (value.isNull() || value.isEmpty())
-    return getShorthandValue(placeContentShorthand());
+    return getShorthandValue(shorthand);
   return value;
 }