zone::handle muti-monitors

resolve:the zone must show in primary screen ,and the others screen will
show background

tower:https://tower.im/projects/1c0cd0c59ef941298c6e6b2ba6833b91/todos/d80f54c247b04067ad02ed9b53452141/

Change-Id: I05cbe8020135bb232fb34714daae76f30e07e40b