Implement select element list box with shadow DOM.

Source/WebCore/html/HTMLOptGroupElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 10 matching lines @@
  *
  */
 
 #ifndef HTMLOptGroupElement_h
 #define HTMLOptGroupElement_h
 
 #include "HTMLElement.h"
 
 namespace WebCore {
     
+class HTMLDivElement;
 class HTMLSelectElement;
 
 class HTMLOptGroupElement : public HTMLElement {
 public:
     static PassRefPtr<HTMLOptGroupElement> create(const QualifiedName&, Document*);
 
     virtual bool isDisabledFormControl() const OVERRIDE;
     HTMLSelectElement* ownerSelectElement() const;
     
     String groupLabelText() const;
 
 private:
     HTMLOptGroupElement(const QualifiedName&, Document*);
 
     virtual const AtomicString& formControlType() const;
     virtual bool supportsFocus() const;
     virtual bool isFocusable() const;
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
-    virtual bool rendererIsNeeded(const NodeRenderingContext&) { return false; }
-    virtual void attach();
-    virtual void detach();
+    virtual void didAddUserAgentShadowRoot(ShadowRoot*) OVERRIDE;
 
     virtual void childrenChanged(bool changedByParser = false, Node* beforeChange = 0, Node* afterChange = 0, int childCountDelta = 0);
 
     virtual void accessKeyAction(bool sendMouseEvents);
 
-    // <optgroup> never has a renderer so we manually manage a cached style.
-    void updateNonRenderStyle();
-    virtual RenderStyle* nonRendererStyle() const OVERRIDE;
-    virtual PassRefPtr<RenderStyle> customStyleForRenderer() OVERRIDE;
+    void recalcSelectOptions();
+    void updateGroupLabel();
 
-    void recalcSelectOptions();
+    HTMLDivElement* m_groupLabelElement;
+};
 
-    RefPtr<RenderStyle> m_style;
-};
+HTMLOptGroupElement* toHTMLOptGroupElement(Node*);
 
 } //namespace
 
 #endif