Add support for Expect-Staple report URIs

[dadrian]

This allows expect-staple report URIs to be added to the Huffman table generated by transport_security_state_static_generator.

I don't really expect this to be merge ready, but mostly wanted to check that I wasn't doing anything ridiculously wrong. For reference, Expect-Staple is described at https://docs.google.com/document/d/1aISglJIIwglcOAhqNfK-2vtQl-_dWAapc-VLDh-9-BE/edit#heading=h.rkpittae54q

[lgarron]

This script will hopefully go the way of the dodo soon, but I guess this is still the right place until then.

Assuming this code does the right thing, it looks good. Do you know if this makes the Huffman tree output larger, and how much?

[dadrian]

Pre-patch:

$ wc -c transport_security_state_static.h
730849 transport_security_state_static.h

Post-patch

$ wc -c transport_security_state_static.h 
741297 transport_security_state_static.h

That's including the 58 bytes for the (empty) Expect-Staple report URI table.

[lgarron]

Alright, not too bad. :-)

[dadrian]

As for correctness, I think does what I want? I mostly based it off of @estark37's similar change for Expect-CT (0936fb4d387a3e453d249ee76a6e40bfdd0977a9).

[lgarron]

Yeah, that should be fine. Is this safe to merge now, or does it depend on Chromium changes?

[dadrian]

:tada: