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Add a DevTools Domain that allows enabling and disabling the WebAuthn Virtual
Authenticator Environment. Eventually the domain will have a set of methods to
add and interact with authenticators.

This patch also removes a race condition from the
devtools/agents-enable-disable.js web test that was made apparent by adding this
domain. Domains' `.disable` methods are no longer assumed to be finish in the
same order as their `.enable` methods.

For an overview of the overall design, please see
https://docs.google.com/document/d/1bp2cMgjm2HSpvL9-WsJoIQMsBi1oKGQY6CvWD-9WmIQ/edit?usp=sharing

Bug: 922572
Change-Id: Id43c184e5830de72736410049fdacba9a965a6d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1617550
Commit-Queue: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664392}