Merge "Decouple FUSE mount from main thread for demo user" into rvc-dev am: 931d7d2703 am: 4e14ca12d6

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

Change-Id: I7da036f1871ea3074986c29680212cc7c1643f7e