CSS Custom Properties (Variables)

Source/core/css/resolver/StyleResolverState.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple 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 136 matching lines @@
     }
     void setTextOrientation(TextOrientation textOrientation)
     {
         if (m_style->setTextOrientation(textOrientation))
             m_fontBuilder.didChangeTextOrientation();
     }
 
     void setHasDirAutoAttribute(bool value) { m_hasDirAutoAttribute = value; }
     bool hasDirAutoAttribute() const { return m_hasDirAutoAttribute; }
 
+    bool documentUsesCSSVariables() const;
+
 private:
     ElementResolveContext m_elementContext;
     RawPtrWillBeMember<Document> m_document;
 
     // m_style is the primary output for each element's style resolve.
     RefPtr<ComputedStyle> m_style;
 
     CSSToLengthConversionData m_cssToLengthConversionData;
 
     // m_parentStyle is not always just ElementResolveContext::parentStyle,
     // so we keep it separate.
     RefPtr<ComputedStyle> m_parentStyle;
 
     OwnPtrWillBeMember<CSSAnimationUpdate> m_animationUpdate;
 
     bool m_applyPropertyToRegularStyle;
     bool m_applyPropertyToVisitedLinkStyle;
     bool m_hasDirAutoAttribute;
 
     FontBuilder m_fontBuilder;
 
     OwnPtr<CachedUAStyle> m_cachedUAStyle;
 
     ElementStyleResources m_elementStyleResources;
 };
 
 } // namespace blink
 
 #endif // StyleResolverState_h