[RTCRtpScriptTransform-encoded-transform.https.html]
  bug: 1709960
  expected:
    if os == "win": OK
    if os == "linux": OK
    [OK, TIMEOUT]
  [Receiver and sender read, modifiy and write video frames.]
    bug: 1709960
    expected:
      if os == "mac": [PASS, TIMEOUT]

  [Receiver and sender read, modifiy and write audio frames.]
    bug: 1709960
    expected:
      if os == "mac": [PASS, NOTRUN]

  [Sender reads frames but doesn't write them back. Receiver doesn't receive any frames.]
    bug: 1709960
    expected:
      if os == "mac": [PASS, NOTRUN]

  [Sender skips some frames and only writes one back. Receiver only receives that frame.]
    bug: 1709960
    expected:
      if os == "mac": [PASS, NOTRUN]