Implement select listbox using shadow DOM

Source/core/accessibility/AXObjectCache.cpp

 /*
  * Copyright (C) 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 272 matching lines @@
         return AXARIAGrid::create(renderer);
     if (nodeHasRole(node, "row"))
         return AXARIAGridRow::create(renderer);
     if (nodeHasRole(node, "gridcell") || nodeHasRole(node, "columnheader") || nodeHasRole(node, "rowheader"))
         return AXARIAGridCell::create(renderer);
 
     // media controls
     if (node && node->isMediaControlElement())
         return AccessibilityMediaControl::create(renderer);
 
+    if (isHTMLOptionElement(node))
+        return AXListBoxOption::create(renderer);
+
     if (renderer->isSVGRoot())
         return AXSVGRoot::create(renderer);
 
     if (renderer->isBoxModelObject()) {
         RenderBoxModelObject* cssBox = toRenderBoxModelObject(renderer);
         if (cssBox->isListBox())
             return AXListBox::create(toRenderListBox(cssBox));
         if (cssBox->isMenuList())
             return AXMenuList::create(toRenderMenuList(cssBox));
 
@@ skipping 150 matching lines @@
 
     return getOrCreate(m_document.view());
 }
 
 AXObject* AXObjectCache::getOrCreate(AccessibilityRole role)
 {
     RefPtr<AXObject> obj = nullptr;
 
     // will be filled in...
     switch (role) {
-    case ListBoxOptionRole:
-        obj = AXListBoxOption::create();
-        break;
     case ImageMapLinkRole:
         obj = AXImageMapLink::create();
         break;
     case ColumnRole:
         obj = AXTableColumn::create();
         break;
     case TableHeaderContainerRole:
         obj = AXTableHeaderContainer::create();
         break;
     case SliderThumbRole:
@@ skipping 545 matching lines @@
 void AXObjectCache::setCanvasObjectBounds(Element* element, const LayoutRect& rect)
 {
     AXObject* obj = getOrCreate(element);
     if (!obj)
         return;
 
     obj->setElementRect(rect);
 }
 
 } // namespace WebCore