1/n Start adding Face settings (base, intro)

This change refactors common biometric settings code as well to minimize
duplicated code in areas such as:
    Preference Controller
    EnrollBase
    EnrollIntro

This change also updates ChooseLock to have Face + Pin/Pattern/Pass

Bug: 110589286

Test: Fingerprint settings/enrollment still works
Test: make -j56 RunSettingsRoboTests
Change-Id: Ie35406a01b85617423beece42683ac086e9bc4a7

src/com/android/settings/Utils.java

@@ -49,6 +49,7 @@ import android.graphics.Canvas;
 import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.VectorDrawable;
+import android.hardware.face.FaceManager;
 import android.hardware.fingerprint.FingerprintManager;
 import android.net.ConnectivityManager;
 import android.net.LinkProperties;
@@ -813,6 +814,19 @@ public final class Utils extends com.android.settingslib.Utils {
         return fingerprintManager != null && fingerprintManager.isHardwareDetected();
     }
 
+    public static FaceManager getFaceManagerOrNull(Context context) {
+        if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_FACE)) {
+            return (FaceManager) context.getSystemService(Context.FACE_SERVICE);
+        } else {
+            return null;
+        }
+    }
+
+    public static boolean hasFaceHardware(Context context) {
+        FaceManager faceManager = getFaceManagerOrNull(context);
+        return faceManager != null && faceManager.isHardwareDetected();
+    }
+
     /**
      * Launches an intent which may optionally have a user id defined.
      * @param fragment Fragment to use to launch the activity.