Support display: contents for elements, first-line and first-letter pseudos.

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 422 matching lines @@
   ShadowRoot* shadowRootIfV1() const;
 
   ShadowRoot& ensureUserAgentShadowRoot();
 
   bool isInDescendantTreeOf(const Element* shadowHost) const;
 
   // Returns the Element’s ComputedStyle. If the ComputedStyle is not already
   // stored on the Element, computes the ComputedStyle and stores it on the
   // Element’s ElementRareData.  Used for getComputedStyle when Element is
   // display none.
+  //
+  // Also, note that the same is used to store "display: contents" elements
+  // styles.
   const ComputedStyle* ensureComputedStyle(PseudoId = PseudoIdNone);
 
+  // Returns the display: contents style.
+  ComputedStyle* displayContentsStyle() const;

[jfernandez, 2016/10/27 17:08:01]

I guess we want the return value to be const.

+
+  // Stores the "display: contents" style of the element.
+  void storeDisplayContentsStyle(ComputedStyle&);
+
   // Methods for indicating the style is affected by dynamic updates (e.g.,
   // children changing, our position changing in our sibling list, etc.)
   bool styleAffectedByEmpty() const {
     return hasElementFlag(StyleAffectedByEmpty);
   }
   void setStyleAffectedByEmpty() { setElementFlag(StyleAffectedByEmpty); }
 
   void setIsInCanvasSubtree(bool value) {
     setElementFlag(IsInCanvasSubtree, value);
   }
@@ skipping 704 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