Merge "Decouple FUSE mount from main thread for demo user" into rvc-dev am:...

Merge "Decouple FUSE mount from main thread for demo user" into rvc-dev am: 931d7d27 am: 4e14ca12 am: 0ee976f4 am: 8680d681

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12261202

Change-Id: Id22a575d93ed567e7d2658b83940ef46a2e805f2