Implement select listbox using shadow DOM

Source/core/rendering/RenderBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. 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
@@ skipping 759 matching lines @@
 }
 
 RenderBox* RenderBox::findAutoscrollable(RenderObject* renderer)
 {
     while (renderer && !(renderer->isBox() && toRenderBox(renderer)->canAutoscroll())) {
         if (!renderer->parent() && renderer->node() == renderer->document() && renderer->document().ownerElement())
             renderer = renderer->document().ownerElement()->renderer();
         else
             renderer = renderer->parent();
     }
-

[tkent, 2014/07/08 02:20:59]

This change looks unnecessary.

[keishi, 2014/07/10 09:48:04]

Done.

     return renderer && renderer->isBox() ? toRenderBox(renderer) : 0;
 }
 
 static inline int adjustedScrollDelta(int beginningDelta)
 {
     // This implemention matches Firefox's.
     // http://mxr.mozilla.org/firefox/source/toolkit/content/widgets/browser.xml#856.
     const int speedReducer = 12;
 
     int adjustedDelta = beginningDelta / speedReducer;
@@ skipping 3876 matching lines @@
         return 0;
 
     if (!layoutState && !flowThreadContainingBlock())
         return 0;
 
     RenderBlock* containerBlock = containingBlock();
     return containerBlock->offsetFromLogicalTopOfFirstPage() + logicalTop();
 }
 
 } // namespace WebCore