[RTCRtpReceiver-getSynchronizationSources.https.html]
  expected:
    if (os == "linux") and not debug and fission and (processor == "x86_64"): [OK, CRASH]
    if (os == "android") and fission: [OK, TIMEOUT]
  [[audio-only\] RTCRtpSynchronizationSource.voiceActivityFlag is a boolean]
    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1525394
    expected: FAIL