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

tests/robotests/src/com/android/settings/search/BaseSearchIndexProviderTest.java

@@ -28,6 +28,7 @@ import com.android.settings.R;
 import com.android.settings.core.BasePreferenceController;
 import com.android.settings.core.PreferenceControllerMixin;
 import com.android.settingslib.core.AbstractPreferenceController;
+import com.android.settingslib.search.SearchIndexableRaw;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -77,6 +78,12 @@ public class BaseSearchIndexProviderTest {
         public String getPreferenceKey() {
             return TEST_PREF_KEY;
         }
+
+        @Override
+        public void updateDynamicRawDataToIndex(List<SearchIndexableRaw> rawData) {
+            final SearchIndexableRaw raw = new SearchIndexableRaw(this.mContext);
+            rawData.add(raw);
+        }
     }
 
     @Test
@@ -190,4 +197,18 @@ public class BaseSearchIndexProviderTest {
 
         assertThat(nonIndexableKeys).contains("pref_key_5");
     }
+
+    @Test
+    public void getDynamicRawDataToIndex_noPreferenceController_shouldReturnEmptyList() {
+        assertThat(mIndexProvider.getDynamicRawDataToIndex(mContext, true)).isEmpty();
+    }
+
+    @Test
+    public void getDynamicRawDataToIndex_hasDynamicRaw_shouldNotEmpty() {
+        List<AbstractPreferenceController> controllers = new ArrayList<>();
+        controllers.add(new AvailablePreferenceController(mContext));
+        doReturn(controllers).when(mIndexProvider).createPreferenceControllers(mContext);
+
+        assertThat(mIndexProvider.getDynamicRawDataToIndex(mContext, true)).isNotEmpty();
+    }
 }