making uuid field on OpaqueOrigin public

[Chandler]

by default, fields on tuple structs are private[1]. In this case, an instance of OpaqueOrigin is not very useful if the only field is private and there's no getter.

[1] https://github.com/rust-lang/rfcs/blob/master/text/0001-private-fields.md

[Ms2ger]

The point is that you can only compare these for equality and change them. Exposing the internal representation is explicitly not something we want to allow.

[Chandler]

@Ms2ger hmm, I was confused, now I'm more confused. If this value is private, what will print out in servo when you call location.origin in the case where a normal (protocol, host, port) origin couldn't be created?

I assumed it would be the value of the uuid in the OpaqueOrigin but it seems that's not totally obvious.
whatwg/url#21
jsdom/whatwg-url#10

I'm working on adding origin to servo's location and url APIs. I guess I can just have it return "protocol://" like in chrome?

Chrome:

new URL("accc://abcsdd.com/adf").origin
"accc://"

[Ms2ger]

https://html.spec.whatwg.org/multipage/browsers.html#unicode-serialisation-of-an-origin

If the origin in question is not a scheme/host/port tuple, then return the literal string "null" and abort these steps.

[KiChjang]

@jdm has an open PR that works on the origin issue: servo/servo#8658