private void ensureCompanionsIsMutable() {
      if (!((bitField0_ & 0x00000002) != 0)) {
        companions_ =
            new java.util.ArrayList<com.google.cloud.video.stitcher.v1.Companion>(companions_);
        bitField0_ |= 0x00000002;
      }
    }
<pre>
Indicates how many of the companions should be displayed with the ad.
</pre>

<code>
.google.cloud.video.stitcher.v1.CompanionAds.DisplayRequirement display_requirement = 1;
</code>

@return This builder for chaining.
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/CompanionAds.java