setSegmentAvailabilityDuration(segmentAvailabilityDuration) {
    goog.asserts.assert(segmentAvailabilityDuration >= 0,
        'segmentAvailabilityDuration must be >= 0');
    this.segmentAvailabilityDuration_ = segmentAvailabilityDuration;
  }
Sets the presentation's segment availability duration. The segment
availability duration should only be set for live.

@param {number} segmentAvailabilityDuration The presentation's new segment
  availability duration in seconds.
@export