Add feature provider for dashboard.

The feature provider contains API that controls whether a new
information architecture should be used. By default it's false.

Bug: 31768091
Test: make RunSettingsRoboTests
Change-Id: I5b177be418def50d877f53dc799e42d06eba95ec

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

@@ -22,6 +22,7 @@ import android.util.Log;
 
 import com.android.settings.R;
 import com.android.settings.core.instrumentation.MetricsFeatureProvider;
+import com.android.settings.dashboard.DashboardFeatureProvider;
 import com.android.settings.fuelgauge.PowerUsageFeatureProvider;
 
 /**
@@ -67,6 +68,8 @@ public abstract class FeatureFactory {
 
     public abstract PowerUsageFeatureProvider getPowerUsageFeatureProvider();
 
+    public abstract DashboardFeatureProvider getDashboardFeatureProvider();
+
     public static final class FactoryNotFoundException extends RuntimeException {
         public FactoryNotFoundException(Throwable throwable) {
             super("Unable to create factory. Did you misconfigure Proguard?", throwable);