private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.video.stitcher.v1.CompanionAds,
            com.google.cloud.video.stitcher.v1.CompanionAds.Builder,
            com.google.cloud.video.stitcher.v1.CompanionAdsOrBuilder>
        getCompanionAdsFieldBuilder() {
      if (companionAdsBuilder_ == null) {
        companionAdsBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.video.stitcher.v1.CompanionAds,
                com.google.cloud.video.stitcher.v1.CompanionAds.Builder,
                com.google.cloud.video.stitcher.v1.CompanionAdsOrBuilder>(
                getCompanionAds(), getParentForChildren(), isClean());
        companionAds_ = null;
      }
      return companionAdsBuilder_;
    }
<pre>
Metadata of companion ads associated with the ad.
</pre>

<code>.google.cloud.video.stitcher.v1.CompanionAds companion_ads = 2;</code>
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/VodSessionAd.java