Merge "Decouple FUSE mount from main thread for demo user" into rvc-dev am: 931d7d2703 am: 962b992032 am: 40517a5d4d

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

Change-Id: Icd90b493250a56c7d667f0da75415e2c4e5097b9