Follow-up of #7946. JIRA issue: CORE-7237 - Implement ABM_GETSTATE, ABM_GETTASKBARPOS, ABM_ACTIVATE, ABM_WINDOWPOSCHANGED, ABM_GETAUTOHIDEBAR, ABM_SETAUTOHIDEBAR, and ABM_SETSTATE appbar messages. - Implement TWM_SETZORDER tray message.