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No prompting for permissions is implemented yet, so all permissions are always
denied unless chrome was launched with --enable-experimental-web-platform-features.
This implements the plumbing/ground work on top of which
prompting and a more complicated permission model will be added.

Also operations don't actually check if permissions have been granted, that too
will be added in a follow-up CL.

Tbr: jbroman
Bug: 878585
Change-Id: I2325fdcebbc3ccf1f688b101f01fd5b20437d3b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636471
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666549}