Add new method to preference controller base for dynamic index.

- Add updateDynamicRawDataToIndex method.
- Implement preference controller index in BaseSearchIndexProvider.

Fixes: 144545478
Test: make RunSettingsGoogleRoboTests -j
      make RunSettingsRoboTests ROBOTEST_FILTER=
      com.android.settings.search.BaseSearchIndexProviderTest
Change-Id: Ibb11002227b280102b45d7c0610eae48ecf4c0f3

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

@@ -77,8 +77,25 @@ public class BaseSearchIndexProvider implements Indexable.SearchIndexProvider {
     }
 
     @Override
+    @CallSuper
     public List<SearchIndexableRaw> getDynamicRawDataToIndex(Context context, boolean enabled) {
-        return null;
+        final List<SearchIndexableRaw> dynamicRaws = new ArrayList<>();
+        final List<AbstractPreferenceController> controllers = getPreferenceControllers(context);
+        if (controllers == null || controllers.isEmpty()) {
+            return dynamicRaws;
+        }
+        for (AbstractPreferenceController controller : controllers) {
+            if (controller instanceof PreferenceControllerMixin) {
+                ((PreferenceControllerMixin) controller).updateDynamicRawDataToIndex(dynamicRaws);
+            } else if (controller instanceof BasePreferenceController) {
+                ((BasePreferenceController) controller).updateDynamicRawDataToIndex(dynamicRaws);
+            } else {
+                Log.e(TAG, controller.getClass().getName()
+                        + " must implement " + PreferenceControllerMixin.class.getName()
+                        + " treating the dynamic indexable");
+            }
+        }
+        return dynamicRaws;
     }
 
     @Override