[RTCRtpReceiver-getSynchronizationSources.https.html]
  bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1525394
  expected: TIMEOUT
  [[video\] RTCRtpSynchronizationSource.timestamp is a number]
    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1525394
    expected: NOTRUN

  [[audio-only\] RTCRtpSynchronizationSource.voiceActivityFlag is a boolean]
    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1525394
    expected: NOTRUN

  [[video\] getSynchronizationSources() does not contain SSRCs older than 10 seconds]
    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1525394
    expected: NOTRUN

  [[video\] getSynchronizationSources() eventually returns a non-empty list]
    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1525394
    expected: TIMEOUT

  [[video\] RTCRtpSynchronizationSource.timestamp is comparable to performance.timeOrigin + performance.now()]
    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1525394
    expected: NOTRUN

  [[audio-only\] RTCRtpSynchronizationSource.audioLevel is a number [0, 1\]]
    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1525394
    expected: NOTRUN

  [[video\] RTCRtpSynchronizationSource.source is a number]
    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1525394
    expected: NOTRUN

  [[audio\] RTCRtpSynchronizationSource.rtpTimestamp is a number [0, 2^32-1\]]
    expected: PASS

  [[video\] RTCRtpSynchronizationSource.rtpTimestamp is a number [0, 2^32-1\]]
    expected: NOTRUN

