Implement select listbox using shadow DOM

Source/core/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 11 matching lines @@
  */
 
 #ifndef HTMLOptGroupElement_h
 #define HTMLOptGroupElement_h
 
 #include "core/html/HTMLElement.h"
 
 namespace WebCore {
 
 class HTMLSelectElement;
+class HTMLDivElement;
 
 class HTMLOptGroupElement FINAL : public HTMLElement {
 public:
-    DECLARE_NODE_FACTORY(HTMLOptGroupElement);
+    static PassRefPtrWillBeRawPtr<HTMLOptGroupElement> create(Document&);
 
     virtual bool isDisabledFormControl() const OVERRIDE;
     HTMLSelectElement* ownerSelectElement() const;
 
     String groupLabelText() const;
 
-    bool isDisplayNone() const;
-
 private:
     explicit HTMLOptGroupElement(Document&);
 
-    virtual bool rendererIsFocusable() const OVERRIDE;
+    virtual bool rendererIsFocusable() const OVERRIDE { return true; }
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
-    virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE { return false; }
-    virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
-    virtual void detach(const AttachContext& = AttachContext()) OVERRIDE;
+    virtual void childrenChanged(const ChildrenChange&) OVERRIDE;
+    virtual void accessKeyAction(bool sendMouseEvents) OVERRIDE;
+    virtual void didAddUserAgentShadowRoot(ShadowRoot&) OVERRIDE;
 
-    virtual void childrenChanged(const ChildrenChange&) OVERRIDE;
-
-    virtual void accessKeyAction(bool sendMouseEvents) OVERRIDE;
-
-    // <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 updateGroupLabel();
     void recalcSelectOptions();
-
-    RefPtr<RenderStyle> m_style;
+    HTMLDivElement& optGroupLabelElement() const;
 };
 
 } //namespace
 
 #endif