[HighResTime] Web Worker support

Hi guys,

Sorry to raise this again, but we keep getting bugged about it. How hard
would it be to add Web Workers to High Res Time? The first edition is
already a recommendation, so I think we'd need to create a level 2 spec for
it.

Does anyone know how large of a change to the spec it'd be? Is it just a
matter of adding one tag to the IDL? If so, it seems like we might be able
to do it relatively quickly.

Thanks,
James