Re: [fetch] expand Request.destination with more granular values (#211)

I think expanding "unknown" and "subresource" is fine, but I would like to see a more concrete description of what the new proposed values are.

Assuming that the suggestion is to add something like [this](https://docs.google.com/spreadsheets/d/1YXoso_Vm0tCuGjFxNmD70UlQd87PKIgGBM97DG9E2L0/edit#gid=0), here are some problems I can think of:

* For "audio" and "video", the distinction seems arbitrary given that you can load an audio file in a <video> element and vice versa (Firefox implements this, Chrome doesn't last I checked.)
* Using "script" for `importScripts()` but "worker" for top-level worker scripts seems inconsistent.  Can we use "worker" for the latter?
* Not sure what the rationale of using "script" for XSLT is...

(Note that I will be on vacation between Feb 10-20.)

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