private void maybeForceBuilderInitialization() {
        if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
          getStartTimeFieldBuilder();
        }
      }
<pre>
The track info for annotations from occupancy counting operator.
</pre>

Protobuf type {@code google.cloud.visionai.v1.OccupancyCountingPredictionResult.TrackInfo}
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/OccupancyCountingPredictionResult.java