Merge "Decouple FUSE mount from main thread for demo user" into rvc-dev am: 931d7d2703 am: 962b992032 am: 40517a5d4d am: 5c52ac5711

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

Change-Id: I3c2b127a58c6d94d5c227283d7e6112f9603c89d