Re: [webrtc-pc] Restart process to apply description if addTrack called (#2504)

> @henbos Thanks for the codepen! I've filed [bug 1626414](https://bugzil.la/1626414) on the 75 regression.

Add https://codepen.io/henbos/pen/ZEGPXee?editors=0010 to the bug and you can also verify that the association still happens after `await srdPromise;`

In Chrome I get...
```
#transceivers on offer: 2
#transceivers after SRD (no await): 0
#transceivers after addTrack (still no await): 1
- addTrack()'s transceiver's mid (before await): "0"
#transceivers after await: 2
- addTrack()'s transceiver's mid (after await): "0"
```
But the correct output should be...
```
#transceivers on offer: 2
#transceivers after SRD (no await): 0
#transceivers after addTrack (still no await): 1
- addTrack()'s transceiver's mid (before await): null
#transceivers after await: 2
- addTrack()'s transceiver's mid (after await): "0"
```
Which is exactly what I see in Firefox 74.0

-- 
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Received on Wednesday, 1 April 2020 07:41:17 UTC