[RTCPeerConnection-getStats.https.html]
[getStats() audio and video validate all mandatory stats]
bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1817097
expected: [FAIL, PASS]
[getStats() with connected peer connections having tracks and data channel should return all mandatory to implement stats]
bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1813824
expected: FAIL
[getStats() video outbound-rtp contains all mandatory stats]
bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1813847
expected: [PASS, FAIL]
[getStats() track without stream returns peer-connection and outbound-rtp stats]
bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1813847
expected: [PASS, FAIL]