message: Condition frame pacing on min/max playout delay
  As a first step we only want to enable frame pacing for the case
  where min playout delay == 0 and max playout delay > 0.
  Cr-Commit-Position: refs/heads/master@{#34752}
diff: @@ -213,7 +213,8 @@ int64_t VCMTiming::MaxWaitingTime(int64_t render_time_ms,
  bool too_many_frames_queued) const {
  MutexLock lock(&mutex_);
  - if (render_time_ms == 0 && zero_playout_delay_min_pacing_->us() > 0) {
  + if (render_time_ms == 0 && zero_playout_delay_min_pacing_->us() > 0 &&
  + min_playout_delay_ms_ == 0 && max_playout_delay_ms_ > 0) {
  // `render_time_ms` == 0 indicates that the frame should be decoded and
  // rendered as soon as possible. However, the decoder can be choked if too
  // many frames are sent at once. Therefore, limit the interframe delay to
  