Add display settings dashboard to new IA.

- Added a activity-alias pointing to displaySettings as top level
  setting item.
- Refactored all preference logic in DisplaySettings into
  PreferenceControllers. During fragment onAttach it installs all
  controllers, and during onResume it updates preference state. Each
  controller listens to its own preference change event.

Bug: 31800242
Test: RunSettingsRoboTests
Change-Id: Ibc9bf200c5acce7c4ae9292340822afee27a3a28

src/com/android/settings/system/SystemDashboardFragment.java

@@ -20,7 +20,9 @@ import android.os.UserManager;
 import android.provider.SearchIndexableResource;
 
 import com.android.settings.R;
+import com.android.settings.core.PreferenceController;
 import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.deviceinfo.AdditionalSystemUpdatePreferenceController;
 import com.android.settings.deviceinfo.SystemUpdatePreferenceController;
 import com.android.settings.overlay.FeatureFactory;
 import com.android.settings.search.BaseSearchIndexProvider;
@@ -47,18 +49,8 @@ public class SystemDashboardFragment extends DashboardFragment {
     }
 
     @Override
-    public void onAttach(Context context) {
-        super.onAttach(context);
-        addPreferenceController(
-                new SystemUpdatePreferenceController(context, UserManager.get(context)));
-    }
-
-    @Override
-    protected void displayResourceTiles() {
-        addPreferencesFromResource(R.xml.system_dashboard_fragment);
-
-        getPreferenceController(SystemUpdatePreferenceController.class)
-                .displayPreference(getPreferenceScreen());
+    protected int getPreferenceScreenResId() {
+        return R.xml.system_dashboard_fragment;
     }
 
     @Override
@@ -66,6 +58,14 @@ public class SystemDashboardFragment extends DashboardFragment {
         return CategoryKey.CATEGORY_SYSTEM;
     }
 
+    @Override
+    protected List<PreferenceController> getPreferenceControllers(Context context) {
+        final List<PreferenceController> controllers = new ArrayList<>();
+        controllers.add(new SystemUpdatePreferenceController(context, UserManager.get(context)));
+        controllers.add(new AdditionalSystemUpdatePreferenceController(context));
+        return controllers;
+    }
+
     /**
      * For Search.
      */
@@ -89,10 +89,11 @@ public class SystemDashboardFragment extends DashboardFragment {
                             .isEnabled()) {
                         return null;
                     }
-                    final SystemUpdatePreferenceController systemUpdatePreferenceController =
-                            new SystemUpdatePreferenceController(context, UserManager.get(context));
                     final List<String> keys = new ArrayList<>();
-                    systemUpdatePreferenceController.updateNonIndexableKeys(keys);
+                    new SystemUpdatePreferenceController(context, UserManager.get(context))
+                            .updateNonIndexableKeys(keys);
+                    new AdditionalSystemUpdatePreferenceController(context)
+                            .updateNonIndexableKeys(keys);
                     return keys;
                 }
             };