am 93cb7b67: am e3c4ef80: am 24dce607: DO NOT MERGE: Add status callback for start/stop advertising. cherrypick from master to fix b/13289050

* commit '93cb7b670a886fb12150c683469ad48b0e55176d':
  DO NOT MERGE: Add status callback for start/stop advertising. cherrypick from master to fix b/13289050