Add a flag for moving UdfpsEnroll* from SystemUI to settings.

The added files in this CL are mostly copied from SystemUI. Enabling the flag SETTINGS_SHOW_UDFPS_ENROLL_IN_SETTINGS with this CL, the udfps enrollment icons and progress bar are shown in settings.

Turn this flag on via adb:
adb shell setprop sys.fflag.override.settings_show_udfps_enroll_in_settings true

There are some known issues that will be fixed in the following CLs, including:
- When the finger is down on the screen and the lighting circle on the sensor is shown, the fingerprint icon is not hidden.
- When rotating the screen, fingerprint location is not right.
- Currently the scale factor is hard coded for pixel 7 pro, we should update the scale factor based on the device, etc.

Test: manually tested on device
Bug: 260617060
Change-Id: I5aede070eb1de9eb3b5e1400d6e51a8523079852

src/com/android/settings/biometrics/BiometricEnrollSidecar.java

@@ -40,6 +40,11 @@ public abstract class BiometricEnrollSidecar extends InstrumentedFragment {
         void onEnrollmentHelp(int helpMsgId, CharSequence helpString);
         void onEnrollmentError(int errMsgId, CharSequence errString);
         void onEnrollmentProgressChange(int steps, int remaining);
+        /**
+         * Called when a fingerprint image has been acquired.
+         * @param isAcquiredGood whether the fingerprint image was good.
+         */
+        default void onAcquired(boolean isAcquiredGood) { }
     }
 
     private int mEnrollmentSteps = -1;
@@ -100,6 +105,19 @@ public abstract class BiometricEnrollSidecar extends InstrumentedFragment {
         }
     }
 
+    private class QueuedAcquired extends QueuedEvent {
+        private final boolean isAcquiredGood;
+
+        public QueuedAcquired(boolean isAcquiredGood) {
+            this.isAcquiredGood = isAcquiredGood;
+        }
+
+        @Override
+        public void send(Listener listener) {
+            listener.onAcquired(isAcquiredGood);
+        }
+    }
+
     private final Runnable mTimeoutRunnable = new Runnable() {
         @Override
         public void run() {
@@ -189,6 +207,14 @@ public abstract class BiometricEnrollSidecar extends InstrumentedFragment {
         mEnrolling = false;
     }
 
+    protected void onAcquired(boolean isAcquiredGood) {
+        if (mListener != null) {
+            mListener.onAcquired(isAcquiredGood);
+        } else {
+            mQueuedEvents.add(new QueuedAcquired(isAcquiredGood));
+        }
+    }
+
     public void setListener(Listener listener) {
         mListener = listener;
         if (mListener != null) {