Merge "Wrap start and stop user clients in an operation." into sc-dev am:...

Merge "Wrap start and stop user clients in an operation." into sc-dev am: 64051356 am: 83e59d8d am: 4e5b9e4a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15114213

Change-Id: I8207b695593a24b723b7b2b1d3f216ecbb12879e