private com.google.protobuf.RepeatedFieldBuilderV3<
            com.google.cloud.videointelligence.v1.Track,
            com.google.cloud.videointelligence.v1.Track.Builder,
            com.google.cloud.videointelligence.v1.TrackOrBuilder>
        getTracksFieldBuilder() {
      if (tracksBuilder_ == null) {
        tracksBuilder_ =
            new com.google.protobuf.RepeatedFieldBuilderV3<
                com.google.cloud.videointelligence.v1.Track,
                com.google.cloud.videointelligence.v1.Track.Builder,
                com.google.cloud.videointelligence.v1.TrackOrBuilder>(
                tracks_, ((bitField0_ & 0x00000002) != 0), getParentForChildren(), isClean());
        tracks_ = null;
      }
      return tracksBuilder_;
    }
<pre>
All logo tracks where the recognized logo appears. Each track corresponds
to one logo instance appearing in consecutive frames.
</pre>

<code>repeated .google.cloud.videointelligence.v1.Track tracks = 2;</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1/src/main/java/com/google/cloud/videointelligence/v1/LogoRecognitionAnnotation.java