Add option for settings to push to a device index

The index implementation is optional and left up to the OEM.

Test: Open settings, see content in index
Test: robo tests
Bug: 68378569
Bug: 76102600
Change-Id: Idb8bb1e0cabbbe92e7a852e2eadbdcd8c2ab7d56

src/com/android/settings/search/DeviceIndexFeatureProviderImpl.java

@@ -0,0 +1,31 @@
+/*
+ * 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.search;
+
+import android.content.Context;
+import android.net.Uri;
+
+public class DeviceIndexFeatureProviderImpl implements DeviceIndexFeatureProvider {
+
+    @Override
+    public boolean isIndexingEnabled() {
+        return false;
+    }
+
+    @Override
+    public void index(Context context, CharSequence title, Uri sliceUri, Uri launchUri) {
+        // Not enabled by default.
+    }
+}