Merge "API review: CarAppContextManager. - Separate context change listener from ownership listener. Some apps     may just want to monitor the state." into nyc-dev
am: 5bbcb5e

* commit '5bbcb5e6c93323c012d783e75f90b143d7a4e4ff':
  API review: CarAppContextManager. - Separate context change listener from ownership listener. Some apps     may just want to monitor the state.