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Return the estimated playback position of the current media track or a negative value if not available.
The value returned is estimated by the current process and may not be perfect. The time returned by this method is calculated from the last state change time based on the current play position at that time and the last known playback speed. An application may call RemoteController.SetSynchronizationMode(SynchronizationPosition) to apply a synchronization policy that will periodically re-sync the estimated position with the RemoteControlClient.