Re-land Catch up the spec update in CSS Rhythmic Sizing

third_party/WebKit/Source/core/css/properties/CSSPropertyAPISnapHeight.cpp

-// 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.
-
-#include "core/css/properties/CSSPropertyAPISnapHeight.h"
-
-#include "core/css/CSSValueList.h"
-#include "core/css/parser/CSSParserContext.h"
-#include "core/css/parser/CSSPropertyParserHelpers.h"
-
-namespace blink {
-
-const CSSValue* CSSPropertyAPISnapHeight::parseSingleValue(
-    CSSParserTokenRange& range,
-    const CSSParserContext* context) {
-  CSSPrimitiveValue* unit = CSSPropertyParserHelpers::consumeLength(
-      range, context->mode(), ValueRangeNonNegative);
-  if (!unit)
-    return nullptr;
-  CSSValueList* list = CSSValueList::createSpaceSeparated();
-  list->append(*unit);
-
-  if (CSSPrimitiveValue* position =
-          CSSPropertyParserHelpers::consumePositiveInteger(range)) {
-    if (position->getIntValue() > 100)
-      return nullptr;
-    list->append(*position);
-  }
-
-  return list;
-}
-
-}  // namespace blink