Implement select element list box with shadow DOM.

Source/WebCore/html/HTMLOptGroupElement.h

Index: Source/WebCore/html/HTMLOptGroupElement.h
diff --git a/Source/WebCore/html/HTMLOptGroupElement.h b/Source/WebCore/html/HTMLOptGroupElement.h
index fe181f7c522d15f29f08a49d8a9314c05add24d2..c1113570cb1e1160c309f1350b2e298e248a0c8a 100644
--- a/Source/WebCore/html/HTMLOptGroupElement.h
+++ b/Source/WebCore/html/HTMLOptGroupElement.h
@@ -28,6 +28,7 @@
 
 namespace WebCore {
     
+class HTMLDivElement;
 class HTMLSelectElement;
 
 class HTMLOptGroupElement : public HTMLElement {
@@ -46,24 +47,20 @@ private:
     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();
 
-    RefPtr<RenderStyle> m_style;
+    HTMLDivElement* m_groupLabelElement;
 };
 
+HTMLOptGroupElement* toHTMLOptGroupElement(Node*);
+
 } //namespace
 
 #endif