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If fingerprint auth is supported, the in-session auth dialog needs
to explicitly start fingerprint auth session (so that biometrics
daemon can get prepared for the upcoming fingerprint scans), and
explicitly end fingerprint auth session when no more retries are
expected.

Bug: b:156258540, b:144861739
Change-Id: I7534594a696bd42f6f29fdc85fe8548b5cf8caae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2369336
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801153}