Re: [mediacapture-main] getSupportedConstraints is not prescribing any mandatory to implement constraints (#732)

I would argue they are based on the [webidl](https://w3c.github.io/mediacapture-main/getusermedia.html#dom-mediatracksupportedconstraints#idl-def-mediatracksupportedconstraints):
```js
dictionary MediaTrackSupportedConstraints {
  boolean width = true;
  boolean height = true;
  boolean aspectRatio = true;
  boolean frameRate = true;
  boolean facingMode = true;
  boolean resizeMode = true;
  boolean sampleRate = true;
  boolean sampleSize = true;
  boolean echoCancellation = true;
  boolean autoGainControl = true;
  boolean noiseSuppression = true;
  boolean latency = true;
  boolean channelCount = true;
  boolean deviceId = true;
  boolean groupId = true;
};
```

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Received on Thursday, 8 October 2020 15:09:03 UTC