getComputedStyle(e).quotes always return empty string

Source/core/style/QuotesData.h

 /*
  * Copyright (C) 2011 Nokia Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 23 matching lines @@
     static PassRefPtr<QuotesData> create() { return adoptRef(new QuotesData()); }
     static PassRefPtr<QuotesData> create(const String open, const String close);
     static PassRefPtr<QuotesData> create(UChar open1, UChar close1, UChar open2, UChar close2);
 
     bool operator==(const QuotesData& o) const { return m_quotePairs == o.m_quotePairs; }
     bool operator!=(const QuotesData& o) const { return !(*this == o); }
 
     void addPair(const std::pair<String, String> quotePair);
     const String getOpenQuote(int index) const;
     const String getCloseQuote(int index) const;
+    int size() { return m_quotePairs.size(); }
 
 private:
     QuotesData() { }
 
     Vector<std::pair<String, String>> m_quotePairs;
 };
 
 } // namespace blink
 
 #endif // QuotesData_h