Merge "Move guest creation to background thread" into sc-dev am: 2599b290...

Merge "Move guest creation to background thread" into sc-dev am: 2599b290 am: dd14d693 am: 66f6aaad

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15373286

Change-Id: I3abfc54206e925d8ff342d61f1bffd865d1775c5