HALO: show halo button in pie

Change-Id: I858ec08837559f4b2806df0ac68b8a703189b1db
HALO: halo can save last position now

Change-Id: I5a608b02323ab9fdfa3922a3c9844e75c3a1ab09

fix

Change-Id: I00ced429cfcc90507b8cc14b228a74b8902e67e8