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validation state. Currently, if ConfirmDeviceCredentialBaseFragment is ever re-created due to orientation change, screen getting turned off, etc., relevant state gets lost. This led to the old ConfirmDeviceCredentialBaseFragment handling results which led to issues such as lockscreen not getting set. By addiing a retained RemoteLockscreenValidationFragment, we're able to update the new ConfirmDeviceCredentialBaseFragment that will handle results. We can also retain other important state like the device credential guess to be set after successful validation. Some smaller changes include: * If the activity is finished for any reason other than "Back" getting pressed, RESULT_FIRST_USER is returned instead of RESULT_CANCELED. * CheckBox, "Forgot [LSKF]?" button, and EditText/LockPatternView gets disabled during validation. * The above also stay disabled if ConfirmDeviceCredentialBaseFragment gets re-created and remote lockscreen validation is still in progress. Test: m RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.password Test: Manual Bug: 274983372 Bug: 274991889 Bug: 274792310 Bug: 270395807 Change-Id: Ib6d47430e233a43e6985ab83abae45713c49771f