Merge changes I385b17e0,Ia6cd02db,Ifa5f8959,Ie6cf2440,I5491a341, ...

* changes:
  Import AndroidX mediarouter libraries from build 7930980.
  Move localbroadcastmanager to legacy artifacts
  Move legacy-support-core-utils to androidx-legacy
  Import AndroidX benchmark libraries from build 8099018.
  Import AndroidX benchmark libraries from build 7868412.
  Resolve difference between AOSP and internal