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: d35c1381" into rvc-d1-dev-plus-aosp am: f47bddd1 am: 269dfd93

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

Change-Id: I3b3ce78f864a64759f1fadcfd654df18088be9b2