Adds SecuritySetting feature for providing an alternative SecuritySettings fragment

Bug: 181764224
Test: New tests added to SettingsUnitTests.
Test: Tested manually with and without feature-provided fragment.
Test: No new failures in SettingsUnitTests, or robolectric. No failures in security directory of robolectric tests.
Change-Id: I21038baf3098c18e1713a332085a5efc376f73da

src/com/android/settings/security/SecuritySettingsFeatureProviderImpl.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2021 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.security;
+
+/** Implementation for {@code SecuritySettingsFeatureProvider}. */
+public class SecuritySettingsFeatureProviderImpl implements SecuritySettingsFeatureProvider {
+
+    @Override
+    public boolean hasAlternativeSecuritySettingsFragment() {
+        return false;
+    }
+
+    @Override
+    public String getAlternativeSecuritySettingsFragmentClassname() {
+        return null;
+    }
+}