Merge "MediaRouter: Create BluetoothRouteProvider for each user" into rvc-qpr-dev am: 907ba21f9f am: cf04b9f6a0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12390943

Change-Id: Ic9a73ced2d6adf355ca5b568fc9918c1b578c382