Adds LockScreen SafetySource and SafetySource broadcast receivers.

Adds a basic LockScreen SafetySource with placeholder data.
Adds a no-op Biometric SafetySource.
Adds Broadcast Receiver and responds with data.

Test: atest SettingsUnitTests
Bug: 215516488
Bug: 215515448
Change-Id: I753a10f63fc73984c7ff96347b927bb2ca5a0aba

src/com/android/settings/safetycenter/BiometricsSafetySource.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2022 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.safetycenter;
+
+import android.content.Context;
+
+/** Combined Biometrics Safety Source for Safety Center. */
+public final class BiometricsSafetySource {
+
+    public static final String SAFETY_SOURCE_ID = "BiometricsSafetySource";
+
+    private BiometricsSafetySource() {}
+
+    /** Sends biometric safety data to Safety Center. */
+    public static void sendSafetyData(Context context) {
+        if (!SafetyCenterStatusHolder.get().isEnabled(context)) {
+            return;
+        }
+
+        // TODO(b/215517420): Send biometric data to Safety Center if there are biometrics available
+        // on this device.
+    }
+}