Add summary to special app access.

Get the count of apps that has unrestricted data access and add that to
the summary for Apps & notifications -> Special app access.

Bug: 36376411
Test: make RunSettingsRoboTests
Change-Id: Id80a030e1e066f1391f94114f478091a2a87fcd8

src/com/android/settings/applications/AppAndNotificationDashboardFragment.java

@@ -25,6 +25,7 @@ import com.android.settings.core.PreferenceController;
 import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.search.BaseSearchIndexProvider;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
@@ -55,7 +56,13 @@ public class AppAndNotificationDashboardFragment extends DashboardFragment {
 
     @Override
     protected List<PreferenceController> getPreferenceControllers(Context context) {
-        return null;
+        return buildPreferenceControllers(context);
+    }
+
+    private static List<PreferenceController> buildPreferenceControllers(Context context) {
+        final List<PreferenceController> controllers = new ArrayList<>();
+        controllers.add(new SpecialAppAccessPreferenceController(context));
+        return controllers;
     }
 
     public static final SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
@@ -67,5 +74,10 @@ public class AppAndNotificationDashboardFragment extends DashboardFragment {
                     sir.xmlResId = R.xml.app_and_notification;
                     return Arrays.asList(sir);
                 }
+
+                @Override
+                public List<PreferenceController> getPreferenceControllers(Context context) {
+                    return buildPreferenceControllers(context);
+                }
             };
 }