Add Traversal<*Element>::firstAncestor() API

Source/core/rendering/RenderObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2940 matching lines @@
     if (pseudoStyleRequest.pseudoId < FIRST_INTERNAL_PSEUDOID && !ownStyle && !style()->hasPseudoStyle(pseudoStyleRequest.pseudoId))
         return nullptr;
 
     if (!parentStyle) {
         ASSERT(!ownStyle);
         parentStyle = style();
     }
 
     // FIXME: This "find nearest element parent" should be a helper function.
     Node* n = node();
-    while (n && !n->isElementNode())
-        n = n->parentNode();
+    if (n && !n->isElementNode())
+        n = ElementTraversal::firstAncestor(*n);

[esprehn, 2014/03/21 07:58:33]

This just makes this code slower and more complicated. You only ever need to go
one level to get from a Node to an Element.

[Inactive, 2014/03/21 14:37:24]

Kept this change out.

     if (!n)
         return nullptr;
     Element* element = toElement(n);
 
     if (pseudoStyleRequest.pseudoId == FIRST_LINE_INHERITED) {
         RefPtr<RenderStyle> result = document().ensureStyleResolver().styleForElement(element, parentStyle, DisallowStyleSharing);
         result->setStyleType(FIRST_LINE_INHERITED);
         return result.release();
     }
 
@@ skipping 378 matching lines @@
 {
     if (object1) {
         const WebCore::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif