Merge "Merge "MediaRouter2: Sync routes when first RouteCallback is...

Merge "Merge "MediaRouter2: Sync routes when first RouteCallback is registered" into rvc-dev am: ebb7ae66 am: 813d77ae" into rvc-d1-dev-plus-aosp am: a191e2b7 am: 4093b0a0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11733427

Change-Id: I30bd116c5670fa1e291ba8a41d6d2eff10ce71fb