Implements CSSPropertyAPI for the fragmentation element properties.

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIBoxGroup.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/CSSPropertyAPIBoxGroup.h"
+
+#include "core/css/parser/CSSParserContext.h"

[aazzam, 2017/01/19 00:01:52]

not sure if this include is needed

+#include "core/css/parser/CSSPropertyParserHelpers.h"
+
+namespace blink {
+
+const CSSValue* CSSPropertyAPIBoxGroup::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext* context) {
+  return CSSPropertyParserHelpers::consumePositiveInteger(range);
+}
+
+}  // namespace blink