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When the key type is set to KEY_TYPE_FINGERPRINT, CheckKey will wait
for a fingerprint scan result from biometrics daemon and report the
result. (See http://crrev/c/1941087 for more details.)

This change enables ExtendedAuthenticator to request fingerprint scan
result by calling CheckKey(KEY_TYPE_FINGERPRINT). With this change,
clients of ExtendedAuthenticator can perform fingerprint auth without
having to talk to biometrics daemon directly.

Bug: b:156258540, b:144861739
Change-Id: I923a53afa283dd4794ab8af239da894800a7a3f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364797
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800780}