Bug 1468451 - Add crashtest. r=me

dom/media/tests/crashtests/1468451.html

@@ -0,0 +1,10 @@
+<script>
+alice = new RTCPeerConnection({ iceServers: [{ 'url': 'stun:2' }], }, null)
+bob = new RTCPeerConnection({ }, null)
+alice.createOffer({ offerToReceiveAudio: true })
+track = alice.getReceivers()[0].track
+alice.createOffer({ }).then((offer) => {
+  bob.addEventListener('signalingstatechange', (x) => x.target.addTransceiver(track, {}), { })
+  bob.close()
+})
+</script>

dom/media/tests/crashtests/crashtests.list

@@ -23,6 +23,7 @@ load 1367930_2.html
 pref(browser.link.open_newwindow,2) load 1429507_1.html # window.open() in tab doesn't work for crashtest in e10s, this opens a new window instead
 pref(browser.link.open_newwindow,2) load 1429507_2.html # window.open() in tab doesn't work for crashtest in e10s, this opens a new window instead
 load 1453030.html
+load 1468451.html
 skip-if(Android) load 1490700.html # No screenshare on Android
 load 1505957.html
 load 1511130.html