DO NOT MERGE: Fix deadlock in AcitivityManagerService. am: e8340a9ed5 am: 5c53e1b8bb am: 271aa24036  -s ours am: e44f8fcca4 am: 6b77a4ee55 am: 91ff18a1f6
am: 2a2c463a01  -s ours

Change-Id: Ib7fe0eba9cb3eeb4f42355dde3835753af1c2b5b