on
open fun <TContinuationResult> onSuccessTask(continuation: Continuation<TResult, Task<TContinuationResult>>, executor: Executor): Task<TContinuationResult>
open fun <TContinuationResult> onSuccessTask(continuation: Continuation<TResult, Task<TContinuationResult>>): Task<TContinuationResult>
Runs a continuation when a task completes successfully, forwarding along s or cancellation.