Fixed perf regression by removing tree traversal for text sibling.

third_party/WebKit/Source/core/dom/ContainerNode.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2013 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 1269 matching lines @@
   // O(1) time.  See crbug.com/288225
   StyleResolver& styleResolver = document().ensureStyleResolver();
   Text* lastTextNode = nullptr;
   for (Node* child = lastChild(); child; child = child->previousSibling()) {
     if (child->isTextNode()) {
       toText(child)->recalcTextStyle(change, lastTextNode);
       lastTextNode = toText(child);
     } else if (child->isElementNode()) {
       Element* element = toElement(child);
       if (element->shouldCallRecalcStyle(change))
-        element->recalcStyle(change);
+        element->recalcStyle(change, lastTextNode);
       else if (element->supportsStyleSharing())
         styleResolver.addToStyleSharingList(*element);
       if (element->layoutObject())
         lastTextNode = nullptr;
     }
   }
 }
 
 void ContainerNode::checkForSiblingStyleChanges(SiblingCheckType changeType,
                                                 Element* changedElement,
@@ skipping 167 matching lines @@
     return true;
 
   if (node->isElementNode() && toElement(node)->shadow())
     return true;
 
   return false;
 }
 #endif
 
 }  // namespace blink