* removed the add function from TrackService.kt as it's not used except within the tracker implementations * add private modifier (cherry picked from commit acd927a937e1d7a7253dfd3954969ee9bb00d610)
* removed the add function from TrackService.kt as it's not used except within the tracker implementations * add private modifier (cherry picked from commit acd927a937e1d7a7253dfd3954969ee9bb00d610)