hschlueter ee847d92c5 Wrap processor chain executor service for better exception handling.
The wrapper
* catches exceptions for each task and notifies the
  listener (this will be used more in follow-ups when processFrame
  is split into lots of listeners and callbacks),
* removes finished tasks from the queue and signals any exceptions
  that occurred to the listener each time a new task is executed.

PiperOrigin-RevId: 455345184
2022-06-16 11:23:44 +00:00
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