Make sure ServiceConnection callback is called in main thread

Fix: 33568999

Test: cts-tradefed run cts --module CtsDevicePolicyManagerTestCases
--test com.android.cts.devicepolicy.DeviceOwnerPlusManagedProfileTest

Change-Id: I14c8b5b1f78192429e68a3057430406245a909c8
5 files changed