Implement <select> Popup Menu using PagePopup

Source/core/html/HTMLSelectElement.cpp

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
@@ skipping 1186 matching lines @@
     // the event as handled.
     if (!renderer() || !renderer()->isMenuList() || isDisabledFormControl())
         return;
     // Save the selection so it can be compared to the new selection
     // when dispatching change events during selectOption, which
     // gets called from RenderMenuList::valueChanged, which gets called
     // after the user makes a selection from the menu.
     saveLastSelection();
     if (RenderMenuList* menuList = toRenderMenuList(renderer()))
         menuList->showPopup();
-    int index = selectedIndex();
-    ASSERT(index >= 0);
-    ASSERT_WITH_SECURITY_IMPLICATION(index < static_cast<int>(listItems().size()));
-    setSelectedIndex(index);
     event->setDefaultHandled();
     return;
 }
 
 bool HTMLSelectElement::shouldOpenPopupForKeyDownEvent(KeyboardEvent* keyEvent)
 {
     const String& keyIdentifier = keyEvent->keyIdentifier();
     RenderTheme& renderTheme = RenderTheme::theme();
 
     if (isSpatialNavigationEnabled(document().frame()))
@@ skipping 534 matching lines @@
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_listItems);
 #endif
     HTMLFormControlElementWithState::trace(visitor);
 }
 
 void HTMLSelectElement::didAddUserAgentShadowRoot(ShadowRoot& root)
 {
     RefPtrWillBeRawPtr<HTMLContentElement> content = HTMLContentElement::create(document());
-    content->setAttribute(selectAttr, "option,optgroup");
+    content->setAttribute(selectAttr, "option,optgroup,hr");
     root.appendChild(content);
 }
 
 HTMLOptionElement* HTMLSelectElement::spatialNavigationFocusedOption()
 {
     if (!isSpatialNavigationEnabled(document().frame()))
         return nullptr;
     int focusedIndex = activeSelectionEndListIndex();
     if (focusedIndex < 0)
         focusedIndex = firstSelectableListIndex();
     if (focusedIndex < 0)
         return nullptr;
     HTMLElement* focused = listItems()[focusedIndex];
     return isHTMLOptionElement(focused) ? toHTMLOptionElement(focused) : nullptr;
 }
 
 } // namespace