public Builder setHtmlAdResource(
        com.google.cloud.video.stitcher.v1.HtmlAdResource.Builder builderForValue) {
      if (htmlAdResourceBuilder_ == null) {
        adResource_ = builderForValue.build();
        onChanged();
      } else {
        htmlAdResourceBuilder_.setMessage(builderForValue.build());
      }
      adResourceCase_ = 12;
      return this;
    }
<pre>
The HTML ad resource associated with the companion ad.
</pre>

<code>.google.cloud.video.stitcher.v1.HtmlAdResource html_ad_resource = 12;</code>
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/Companion.java