DO NOT MERGE: Fix deadlock in AcitivityManagerService. am: 2d608378f4  -s ours am: bab9c1006a am: e85152c2fc am: ac143d2dfd  -s ours am: 20bafe850d am: 923f622c15 am: 042fb63071 am: 3c7e989835  -s ours am: eacf98bf52 am: 34a5ce150d
am: 65b110af60  -s ours

Change-Id: I0d01d9857ddbc82c4c4e02b7b15b8514fab10499