Reviewed by Eric Seidel.

        Added four Haiku-specific files for WebCore:
        PopupMenuHaiku.cpp, ScreenHaiku.cpp,
        SearchPopupMenuHaiku.cpp and SoundHaiku.cpp
        https://bugs.webkit.org/show_bug.cgi?id=28080

        * platform/haiku/PopupMenuHaiku.cpp: Added.
        (WebCore::PopupMenu::PopupMenu):
        (WebCore::PopupMenu::~PopupMenu):
        (WebCore::PopupMenu::show):
        (WebCore::PopupMenu::hide):
        (WebCore::PopupMenu::updateFromElement):
        (WebCore::PopupMenu::itemWritingDirectionIsNatural):
        * platform/haiku/ScreenHaiku.cpp: Added.
        (WebCore::screenRect):
        (WebCore::screenAvailableRect):
        (WebCore::screenDepth):
        (WebCore::screenDepthPerComponent):
        (WebCore::screenIsMonochrome):
        * platform/haiku/SearchPopupMenuHaiku.cpp: Added.
        (WebCore::SearchPopupMenu::SearchPopupMenu):
        (WebCore::SearchPopupMenu::saveRecentSearches):
        (WebCore::SearchPopupMenu::loadRecentSearches):
        (WebCore::SearchPopupMenu::enabled):
        * platform/haiku/SoundHaiku.cpp: Added.
        (WebCore::systemBeep):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@46924 268f45cc-cd09-0410-ab3c-d52691b4dbfc