Add a few pages to search index.

- Data saver
- A few special permission access pages
   - Picture-in-picture
   - Premium sms
   - do not disturb access
- And a unrelated cleanup: move EmptyTextFragment from
  notification/ to widget/

Bug: 70720645
Test: robotests
Change-Id: I6a87f712bf81f9fd32fa9a3826fba851ca748409

src/com/android/settings/datausage/UnrestrictedDataAccess.java

@@ -16,6 +16,7 @@ package com.android.settings.datausage;
 
 import android.content.Context;
 import android.os.Bundle;
+import android.provider.SearchIndexableResource;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
@@ -24,9 +25,16 @@ import android.view.View;
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 import com.android.settings.R;
 import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settings.search.Indexable;
 import com.android.settingslib.applications.ApplicationsState;
 import com.android.settingslib.applications.ApplicationsState.AppFilter;
+import com.android.settingslib.search.SearchIndexable;
 
+import java.util.ArrayList;
+import java.util.List;
+
+@SearchIndexable
 public class UnrestrictedDataAccess extends DashboardFragment {
 
     private static final String TAG = "UnrestrictedDataAccess";
@@ -108,4 +116,18 @@ public class UnrestrictedDataAccess extends DashboardFragment {
     protected int getPreferenceScreenResId() {
         return R.xml.unrestricted_data_access_settings;
     }
+
+    public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+            new BaseSearchIndexProvider() {
+                @Override
+                public List<SearchIndexableResource> getXmlResourcesToIndex(Context context,
+                        boolean enabled) {
+                    final ArrayList<SearchIndexableResource> result = new ArrayList<>();
+
+                    final SearchIndexableResource sir = new SearchIndexableResource(context);
+                    sir.xmlResId = R.xml.unrestricted_data_access_settings;
+                    result.add(sir);
+                    return result;
+                }
+            };
 }