Fixed perf regression by removing tree traversal for text sibling.

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 379 matching lines @@
 
   bool hasEquivalentAttributes(const Element* other) const;
 
   virtual void copyNonAttributePropertiesFromElement(const Element&) {}
 
   void attachLayoutTree(const AttachContext& = AttachContext()) override;
   void detachLayoutTree(const AttachContext& = AttachContext()) override;
 
   virtual LayoutObject* createLayoutObject(const ComputedStyle&);
   virtual bool layoutObjectIsNeeded(const ComputedStyle&);
-  void recalcStyle(StyleRecalcChange);
+  void recalcStyle(StyleRecalcChange, Text* nextTextSibling = nullptr);
   StyleRecalcChange rebuildLayoutTree();
   void pseudoStateChanged(CSSSelector::PseudoType);
   void setAnimationStyleChange(bool);
   void clearAnimationStyleChange();
   void setNeedsAnimationStyleRecalc();
 
   void setNeedsCompositingUpdate();
 
   bool supportsStyleSharing() const;
 
@@ skipping 402 matching lines @@
 
   void inlineStyleChanged();
   void setInlineStyleFromString(const AtomicString&);
 
   // If the only inherited changes in the parent element are independent,
   // these changes can be directly propagated to this element (the child).
   // If these conditions are met, propagates the changes to the current style
   // and returns the new style. Otherwise, returns null.
   PassRefPtr<ComputedStyle> propagateInheritedProperties(StyleRecalcChange);
 
-  StyleRecalcChange recalcOwnStyle(StyleRecalcChange);
+  StyleRecalcChange recalcOwnStyle(StyleRecalcChange, Text*);
   inline void checkForEmptyStyleChange();
 
   void updatePseudoElement(PseudoId, StyleRecalcChange);
   bool updateFirstLetter(Element*);
 
   inline void createPseudoElementIfNeeded(PseudoId);
 
   ShadowRoot* shadowRoot() const;
 
   // FIXME: Everyone should allow author shadows.
@@ skipping 321 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