Add CSS parser support for the snap-height property

third_party/WebKit/Source/core/style/StyleRareInheritedData.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 127 matching lines @@
     unsigned m_rubyPosition : 1; // RubyPosition
 
     // Though will-change is not itself an inherited property, the intent
     // expressed by 'will-change: contents' includes descendants.
     unsigned m_subtreeWillChangeContents : 1;
 
     unsigned m_selfOrAncestorHasDirAutoAttribute : 1;
 
     unsigned m_respectImageOrientation : 1;
 
+    unsigned m_snapHeightPosition : 7;
+
     AtomicString hyphenationString;
     short hyphenationLimitBefore;
     short hyphenationLimitAfter;
     short hyphenationLimitLines;
 
+    uint8_t m_snapHeightUnit;
+
     AtomicString textEmphasisCustomMark;
     RefPtr<QuotesData> quotes;
 
     Color tapHighlightColor;
 
     RefPtr<AppliedTextDecorationList> appliedTextDecorations;
     TabSize m_tabSize;
 
     RefPtr<StyleVariableData> variables;
 
 private:
     StyleRareInheritedData();
     StyleRareInheritedData(const StyleRareInheritedData&);
 };
 
 } // namespace blink
 
 #endif // StyleRareInheritedData_h