The instance opens clocks of type CLOCK_BOOTTIME_ALARM and                                                               
CLOCK_REALTIME_ALARM. However, it uses only CLOCK_BOOTTIME_ALARM to set                                                  
wake up alarms. At this point, it's okay to pretend the host supports                                                    
CLOCK_REALTIME_ALARM instead of returning an error.

Modify SimpleAlarmTimer to take a custom clock in the constructor.