Call for consensus for Issue 824

Call for consensus for issue [824](https://github.com/immersive-web/webxr/issues/824).

This an official call for consensus for whether we want to take on the TAG feedback and change the signature of supportsSession?

Vote +1 to accept the proposed change.
Vote -1 to reject the proposed change.

As an official call for consensus this is taken at a per member organisation level so please vote once
for your organisation and state your organisation.

If multiple people vote from an organisation, only one vote per organisation will be counted.

Ada