Implement <select> Popup Menu using PagePopup

Source/core/html/HTMLSelectElement.h

 /*
  * 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) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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
@@ skipping 107 matching lines @@
     // For use in the implementation of HTMLOptionElement.
     void optionSelectionStateChanged(HTMLOptionElement*, bool optionIsSelected);
     void optionRemoved(const HTMLOptionElement&);
     bool anonymousIndexedSetter(unsigned, PassRefPtrWillBeRawPtr<HTMLOptionElement>, ExceptionState&);
 
     void updateListOnRenderer();
 
     HTMLOptionElement* spatialNavigationFocusedOption();
     void handleMouseRelease();
 
+    int listIndexForOption(const HTMLOptionElement&);
+
     virtual void trace(Visitor*) override;
 
 protected:
     HTMLSelectElement(Document&, HTMLFormElement*);
 
 private:
     virtual const AtomicString& formControlType() const override;
 
     virtual bool shouldShowFocusRingOnMouseFocus() const override;
 
@@ skipping 57 matching lines @@
         SkipBackwards = -1,
         SkipForwards = 1
     };
     int nextValidIndex(int listIndex, SkipDirection, int skip) const;
     int nextSelectableListIndex(int startIndex) const;
     int previousSelectableListIndex(int startIndex) const;
     int firstSelectableListIndex() const;
     int lastSelectableListIndex() const;
     int nextSelectableListIndexPageAway(int startIndex, SkipDirection) const;
     int listIndexForEventTargetOption(const Event&);
-    int listIndexForOption(const HTMLOptionElement&);
     AutoscrollController* autoscrollController() const;
 
     virtual void childrenChanged(const ChildrenChange&) override;
     virtual bool areAuthorShadowsAllowed() const override { return false; }
     virtual void finishParsingChildren() override;
 
     // TypeAheadDataSource functions.
     virtual int indexOfSelectedOption() const override;
     virtual int optionCount() const override;
     virtual String optionAtIndex(int index) const override;
@@ skipping 11 matching lines @@
     bool m_multiple;
     bool m_activeSelectionState;
     mutable bool m_shouldRecalcListItems;
     int m_suggestedIndex;
     bool m_isAutofilledByPreview;
 };
 
 } // namespace blink
 
 #endif // HTMLSelectElement_h