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/biometrics/face/FaceStatusPreferenceController.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.biometrics.face;
+
+import android.content.Context;
+import android.hardware.face.FaceManager;
+
+import com.android.settings.R;
+import com.android.settings.Utils;
+import com.android.settings.biometrics.BiometricStatusPreferenceController;
+
+public class FaceStatusPreferenceController extends BiometricStatusPreferenceController {
+
+    private static final String KEY_FACE_SETTINGS = "face_settings";
+
+    protected final FaceManager mFaceManager;
+
+    public FaceStatusPreferenceController(Context context) {
+        this(context, KEY_FACE_SETTINGS);
+    }
+
+    public FaceStatusPreferenceController(Context context, String key) {
+        super(context, key);
+        mFaceManager = Utils.getFaceManagerOrNull(context);
+    }
+
+    @Override
+    protected boolean isDeviceSupported() {
+        return mFaceManager != null && mFaceManager.isHardwareDetected();
+    }
+
+    @Override
+    protected boolean hasEnrolledBiometrics() {
+        return mFaceManager.hasEnrolledFaces(mUserId);
+    }
+
+    @Override
+    protected String getSummaryTextEnrolled() {
+        return mContext.getResources()
+                .getString(R.string.security_settings_face_preference_summary);
+    }
+
+    @Override
+    protected String getSummaryTextNoneEnrolled() {
+        return mContext.getResources()
+                .getString(R.string.security_settings_face_preference_summary_none);
+    }
+
+    @Override
+    protected String getSettingsClassName() {
+        return null;
+    }
+
+    @Override
+    protected String getEnrollClassName() {
+        return FaceEnrollIntroduction.class.getName();
+    }
+
+}