Add summary provider for system tile.

Refactored getLocaleNames() into a FeatureProvider interface so it's
reusable and testable.

Bug: 31801428
Test: RunSettingsRoboTests
Change-Id: I2d31a66a4b32cfa7a364a4cfef1f6eea87084577

src/com/android/settings/overlay/FeatureFactory.java

@@ -24,6 +24,7 @@ import com.android.settings.R;
 import com.android.settings.core.instrumentation.MetricsFeatureProvider;
 import com.android.settings.dashboard.DashboardFeatureProvider;
 import com.android.settings.fuelgauge.PowerUsageFeatureProvider;
+import com.android.settings.localepicker.LocaleFeatureProvider;
 
 /**
  * Abstract class for creating feature controllers. Allows OEM implementations to define their own
@@ -70,6 +71,9 @@ public abstract class FeatureFactory {
 
     public abstract DashboardFeatureProvider getDashboardFeatureProvider(Context context);
 
+    public abstract LocaleFeatureProvider getLocaleFeatureProvider();
+
+
     public static final class FactoryNotFoundException extends RuntimeException {
         public FactoryNotFoundException(Throwable throwable) {
             super("Unable to create factory. Did you misconfigure Proguard?", throwable);