Pass nextTextSibling to ::before layout rebuild.

third_party/WebKit/Source/core/dom/shadow/ShadowRoot.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 101 matching lines @@
   HTMLShadowElement* shadowInsertionPointOfYoungerShadowRoot() const;
   void setShadowInsertionPointOfYoungerShadowRoot(HTMLShadowElement*);
   void didAddInsertionPoint(InsertionPoint*);
   void didRemoveInsertionPoint(InsertionPoint*);
   const HeapVector<Member<InsertionPoint>>& descendantInsertionPoints();
 
   // For Internals, don't use this.
   unsigned childShadowRootCount() const { return m_childShadowRootCount; }
 
   void recalcStyle(StyleRecalcChange);
-  void rebuildLayoutTree();
+  void rebuildLayoutTree(Text*& nextTextSibling);
 
   void registerScopedHTMLStyleChild();
   void unregisterScopedHTMLStyleChild();
 
   SlotAssignment& slotAssignment() {
     DCHECK(m_slotAssignment);
     return *m_slotAssignment;
   }
 
   HTMLSlotElement* assignedSlotFor(const Node&);
@@ skipping 32 matching lines @@
 
   ShadowRootRareDataV0& ensureShadowRootRareDataV0();
   SlotAssignment& ensureSlotAssignment();
 
   void addChildShadowRoot() { ++m_childShadowRootCount; }
   void removeChildShadowRoot() {
     DCHECK_GT(m_childShadowRootCount, 0u);
     --m_childShadowRootCount;
   }
   void invalidateDescendantInsertionPoints();
+  void skipRebuildLayoutTree(Text*& nextTextSibling) const;
 
   Member<ShadowRootRareDataV0> m_shadowRootRareDataV0;
   Member<StyleSheetList> m_styleSheetList;
   Member<SlotAssignment> m_slotAssignment;
   unsigned m_childShadowRootCount : 13;
   unsigned m_type : 2;
   unsigned m_registeredWithParentShadowRoot : 1;
   unsigned m_descendantInsertionPointsIsValid : 1;
   unsigned m_delegatesFocus : 1;
 };
@@ skipping 15 matching lines @@
                   treeScope,
                   treeScope->rootNode().isShadowRoot(),
                   treeScope.rootNode().isShadowRoot());
 DEFINE_TYPE_CASTS(TreeScope, ShadowRoot, shadowRoot, true, true);
 
 CORE_EXPORT std::ostream& operator<<(std::ostream&, const ShadowRootType&);
 
 }  // namespace blink
 
 #endif  // ShadowRoot_h