Merge "Add "clear-last-used-timestamps" command to usagestats service." into...

Merge "Add "clear-last-used-timestamps" command to usagestats service." into tm-dev am: be65c9c0 am: f16710a3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17211948

Change-Id: Ia0e80e893b8269623466d86ac55a0f9a4d0c370e