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Adds the non-preview authenticatorBioEnrollment command and a related
test, which is not at all comprehensive. The functionality should be
the same, so the unit test does not need to be comprehensive. This may
change in the future.

Bug: 974046
Change-Id: Ie0bf030c63ad7633d8ba94a84374e6977da07962
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1665555Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Commit-Queue: Matthew Webb <noviv@google.com>
Cr-Commit-Position: refs/heads/master@{#671935}