public Builder addAllTracks(
        java.lang.Iterable<? extends com.google.cloud.videointelligence.v1.Track> values) {
      if (tracksBuilder_ == null) {
        ensureTracksIsMutable();
        com.google.protobuf.AbstractMessageLite.Builder.addAll(values, tracks_);
        onChanged();
      } else {
        tracksBuilder_.addAllMessages(values);
      }
      return this;
    }
<pre>
The face tracks with attributes.
</pre>

<code>repeated .google.cloud.videointelligence.v1.Track tracks = 3;</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1/src/main/java/com/google/cloud/videointelligence/v1/FaceDetectionAnnotation.java