private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.video.stitcher.v1.GoogleCdnKey,
            com.google.cloud.video.stitcher.v1.GoogleCdnKey.Builder,
            com.google.cloud.video.stitcher.v1.GoogleCdnKeyOrBuilder>
        getGoogleCdnKeyFieldBuilder() {
      if (googleCdnKeyBuilder_ == null) {
        if (!(cdnKeyConfigCase_ == 5)) {
          cdnKeyConfig_ = com.google.cloud.video.stitcher.v1.GoogleCdnKey.getDefaultInstance();
        }
        googleCdnKeyBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.video.stitcher.v1.GoogleCdnKey,
                com.google.cloud.video.stitcher.v1.GoogleCdnKey.Builder,
                com.google.cloud.video.stitcher.v1.GoogleCdnKeyOrBuilder>(
                (com.google.cloud.video.stitcher.v1.GoogleCdnKey) cdnKeyConfig_,
                getParentForChildren(),
                isClean());
        cdnKeyConfig_ = null;
      }
      cdnKeyConfigCase_ = 5;
      onChanged();
      return googleCdnKeyBuilder_;
    }
<pre>
The configuration for a Google Cloud CDN key.
</pre>

<code>.google.cloud.video.stitcher.v1.GoogleCdnKey google_cdn_key = 5;</code>
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/CdnKey.java