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

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

Change-Id: Ic78f1e602e4ecdb4cd48f53168492cb74c22296f