@Override
  public JsonObjectBuilder getJsonObjectBuilder() {
    return Json.createObjectBuilder()
      .add("type", this.type)
      .add("sdp", this.sdp);
  }
RTCCertificateStats, with attributes fingerprint,
fingerprintAlgorithm, base64Certificate, issuerCertificateId
KITE-Framework/src/main/java/org/webrtc/kite/stats/SDP.java