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

third_party/WebKit/Source/core/layout/LayoutObject.h

Index: third_party/WebKit/Source/core/layout/LayoutObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.h b/third_party/WebKit/Source/core/layout/LayoutObject.h
index 52203ef7d78deed99d9c2e611e0d0a1adbd08440..ab95b25652eb2e5ef0510e6a11672e9f16ff6e76 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -30,6 +30,7 @@
 #include "core/CoreExport.h"
 #include "core/dom/Document.h"
 #include "core/dom/DocumentLifecycle.h"
+#include "core/dom/PseudoElement.h"
 #include "core/editing/PositionWithAffinity.h"
 #include "core/layout/LayoutObjectChildList.h"
 #include "core/layout/MapCoordinatesFlags.h"
@@ -68,6 +69,7 @@ class LayoutMultiColumnSpannerPlaceholder;
 class LayoutView;
 class ObjectPaintProperties;
 class PaintLayer;
+class PseudoElement;
 class PseudoStyleRequest;
 
 struct PaintInfo;
@@ -473,6 +475,7 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
   void operator delete(void*);
 
   bool isPseudoElement() const { return node() && node()->isPseudoElement(); }
+  bool isPseudoElementGeneratedContentFor(const PseudoElement&) const;
 
   virtual bool isBoxModelObject() const { return false; }
   bool isBR() const { return isOfType(LayoutObjectBr); }
@@ -1986,6 +1989,11 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
   virtual void insertedIntoTree();
   virtual void willBeRemovedFromTree();
 
+  void setPseudoForAnonymous(PseudoElement& pseudo) {
+    DCHECK(isAnonymous());
+    m_node = &pseudo;
+  }
+
   void setDocumentForAnonymous(Document* document) {
     DCHECK(isAnonymous());
     m_node = document;