[css-align] Implement place-items alignment shorthand

third_party/WebKit/Source/core/css/properties/CSSPropertyAlignmentUtils.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CSSPropertyAlignmentUtils_h
 #define CSSPropertyAlignmentUtils_h
 
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class CSSParserTokenRange;
 class CSSValue;
 
 class CSSPropertyAlignmentUtils {
   STATIC_ONLY(CSSPropertyAlignmentUtils);
 
   static CSSValue* consumeSelfPositionOverflowPosition(CSSParserTokenRange&);
+  static CSSValue* consumeSimplifiedItemPosition(CSSParserTokenRange&);
   static CSSValue* consumeContentDistributionOverflowPosition(
       CSSParserTokenRange&);
   static CSSValue* consumeSimplifiedContentPosition(CSSParserTokenRange&);
 };
 
 }  // namespace blink
 
 #endif  // CSSPropertyAlignmentUtils_h