[css-display] Support display: contents pseudo-elements.

third_party/WebKit/Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003-2011, 2013, 2014 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
@@ skipping 602 matching lines @@
   // Called by the parser when this element's close tag is reached, signaling
   // that all child tags have been parsed and added.  This is needed for
   // <applet> and <object> elements, which can't lay themselves out until they
   // know all of their nested <param>s. [Radar 3603191, 4040848].  Also used for
   // script elements and some SVG elements for similar purposes, but making
   // parsing a special case in this respect should be avoided if possible.
   virtual void finishParsingChildren();
 
   void beginParsingChildren() { setIsFinishedParsingChildren(false); }
 
+  ComputedStyle* pseudoStyle(PseudoId) const;
+  PassRefPtr<ComputedStyle> getUncachedPseudoStyle(PseudoId) const;
+  bool canHaveGeneratedPseudo(PseudoId) const;

[rune, 2017/03/13 10:29:50]

Do these methods need to be public? All of them?

   PseudoElement* pseudoElement(PseudoId) const;
   LayoutObject* pseudoElementLayoutObject(PseudoId) const;
 
   virtual bool matchesDefaultPseudoClass() const { return false; }
   virtual bool matchesEnabledPseudoClass() const { return false; }
   virtual bool matchesReadOnlyPseudoClass() const { return false; }
   virtual bool matchesReadWritePseudoClass() const { return false; }
   virtual bool matchesValidityPseudoClasses() const { return false; }
   bool matches(const String& selectors, ExceptionState&);
   Element* closest(const String& selectors, ExceptionState&);
@@ skipping 568 matching lines @@
 #define DECLARE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
   static T* create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T)                     \
   T* T::create(const QualifiedName& tagName, Document& document) { \
     return new T(tagName, document);                               \
   }
 
 }  // namespace blink
 
 #endif  // Element_h