Re: [w3c/gamepad] id field in gamepad might have a persistent identifier? (#73)

It might also make sense to have `id` (or corresponding broken out fields for descriptor/name and the vendor and product identifiers) as an optional field, if it's needed for certain use cases where a site wants to provide customized functionality for users with particular hardware. 

I can imagine that a user in a private browsing mode or a user with a particular threat model where anonymity is important would not want to reveal the hardware identifier at all, but could still effectively use a gamepad, especially one that used a `standard` mapping. And where an implementation doesn't want to or can't provide detailed vendor/serial information or can't provide a useful human-readable name, we should prepare sites using the API for those fields not to be present.

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