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

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

Index: third_party/WebKit/Source/core/dom/PseudoElement.h
diff --git a/third_party/WebKit/Source/core/dom/PseudoElement.h b/third_party/WebKit/Source/core/dom/PseudoElement.h
index e05dacfc47dd429b3cd2bfa5d77d49dab71b6255..279bafebd19a5b9576b8fcf4d27cd66572dab4ca 100644
--- a/third_party/WebKit/Source/core/dom/PseudoElement.h
+++ b/third_party/WebKit/Source/core/dom/PseudoElement.h
@@ -39,6 +39,7 @@ class CORE_EXPORT PseudoElement : public Element {
 
   PassRefPtr<ComputedStyle> customStyleForLayoutObject() override;
   void attachLayoutTree(const AttachContext& = AttachContext()) override;
+  void detachLayoutTree(const AttachContext& = AttachContext()) override;
   bool layoutObjectIsNeeded(const ComputedStyle&) override;
 
   bool canStartSelection() const override { return false; }
@@ -58,6 +59,7 @@ class CORE_EXPORT PseudoElement : public Element {
   void didRecalcStyle() override;
 
   PseudoId m_pseudoId;
+  std::vector<LayoutObject*> m_generatedContent;

[emilio, 2017/03/13 13:28:31]

This can also go away now.

 };
 
 const QualifiedName& pseudoElementTagName();