ART: Change main-thread thread paging scheme am: a79db76ced am: d3b48537ad am: a5a1146d45 am: d4b94c823f  -s ours am: 68fd95aa24  -s ours
am: 7317360095  -s ours

Change-Id: I11f6c188422e4802710f8b9d65d1d7b2cac1f257