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Currently fingerprint attempts are not treated as user activities.
So when the screen is off, user touch the sensor with an enrolled finger
will silently unlock the screen, with the screen remains off.
And after hitting a key, the screen turns on and already unlocked which
makes user think the screen is never locked.

This CL reports fingerprint attempts as user activity so when user touch
the sensor, the screen will be turned on.


Bug: b:115779078
Change-Id: I10acd8cc3eccb7d594465573fecf9f3099a65f8d
Reviewed-on: https://chromium-review.googlesource.com/1236556
Commit-Queue: Xiaoyin Hu <xiaoyinh@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593603}