This is another step toward fix 5460649 - cleanup
LockPatternKeyguardView (LPKV).
After this change, LPKV has minimal knowledge of FUL. FUL now
implements a new BiometricSensorUnlock interface and LPKV talks to
that interface. Other biometric sensors can implement the same
interface such that LPKV doesn't need to know much about what type
of biometric sensor is being used or its implementation.
The new interface has better, more general function names, so some
function names in FaceUnlock.java were changed. Some of the functions
in FaceUnlock.java were also reordered to match the interface.
This change should not change the behavior of FUL. There are two
places where code functionality was changed:
1) There was a showArea() function and a showAreaWithTimeout()
function that were both called from LPKV. To simplify the interface,
only a show() function is provided - it takes a timeout and if the
timeout is 0 it doesn't do the timeout.
2) There was a stopIfRunning() function that did a check to make sure
FUL was running. If FUL was running, it stopped FUL. Then it
returned a boolean indicating if it had been running. LPKV sometimes
needs to know if FUL was running so it knows if it should restart FUL.
To simplify the interface, a single stop() function is provided which
returns whether or not it was running. I believe the 'if running'
check was redundant and that there was no case where calling stop()
when it wasn't running would cause any badness.
Change-Id: I717268f360aed823e603df8e687cd107aa69ae11
3223e2537d