1) Fixed the theme for CDCA$InternalActivity to be transparent
2) CDCA only cares about biometrics, which are tied to userId
3) Moved shared methods to a util class
Fixes: 119296586
Test: Followed the steps in comment#1 of the bug linked above
Change-Id: Ie47fc7c3a53dfb7780087937e1ca83287cc52d71
ConfirmDeviceCredentials now uses BiometricPrompt instead of
FingerprintManager
Bug: 111461540
Test: FRP does not display BiometricPrompt (as expected)
adb shell settings put global device_provisioned 0 && adb shell am start -a android.app.action.CONFIRM_FRP_CREDENTIAL
Test: Using KeyguardManager API to launch, all corner cases seem OK
Test: Tested with work profile + one lock enabled/disabled, seems OK
Test: Enroll normal FP but not work FP, BiometricPromptDemo for both works
OK
Test: Test CC on work version of BPD, then BP on normal version of BPD,
both accept correct FP's (no regression from P)
Change-Id: Iacdaf76ab76971850212dc79513bfa3f4b89eb9a
