Cherry-pick DeviceMotionService CL from master [do not merge]

In DeviceMotionService, handle the fact that we may receive updates from SensorManager after unregistering.

cherry-pick of Change: d09001fea476ca6c6eaff5e29a1bb6f3aebe5bd5

Bug: 5110230
Change-Id: Id1d1f51b445ce4a14bfcdfad8f173922e01b6563
2 files changed