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In-session auth dialog may involve multiple fingerprint retries. The
contents view needs to display corresponding prompts and animations
upon a fingerprint mismatch. Start fingerprint auth with a callback
from the contents view so that the view can act according to the
fingerprint scan result.

This change also handles fingerprint retry.

Bug: b:156258540, b:144861739
Change-Id: I7a3c29c706e4fe6c3bb0bd3f8dfb9bd1d07d3180
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2369368
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801198}