Merge changes from topic "presubmit-am-a5c9a98efdd2430c9afe42bd3287deda"
* changes:
[automerge] Extract Steps and StepQueue out of VibrationThread. 2p: 7ca22de1 2p: 84432a65
[automerge] Extract Steps and StepQueue out of VibrationThread. 2p: 7ca22de1