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To power the tests we need to setup an HTTP server to handle access
token requests and supervision pages.
It's expected that the Supervision server will return a custom HTTP
header with an specific value when the user is eligible to see the
flow.
We test cases where the server doesn't send the header as well as
when the header doesn't contain the values that we want.

Bug: 958995
Change-Id: Ib8017678951ba9da1ae9b7b5b801c755ee2f7533
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611038Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Lucas Tenório <ltenorio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661083}