Change dark theme screen to toggle

The dark theme screen has been removed in favor of a simple
toggle with a dialog that shows up the first time a user
tries to enable dark theme when in light theme.

Test: robotests pass
Bug: 130251804
Change-Id: I48f8e24a2b2a117e5a8054c5bc0b240ba68fe1ad
diff --git a/src/com/android/settings/DisplaySettings.java b/src/com/android/settings/DisplaySettings.java
index b67e6e8..eb77d4a 100644
--- a/src/com/android/settings/DisplaySettings.java
+++ b/src/com/android/settings/DisplaySettings.java
@@ -18,11 +18,13 @@
 
 import android.app.settings.SettingsEnums;
 import android.content.Context;
+import android.os.Bundle;
 import android.provider.SearchIndexableResource;
 
 import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.display.BrightnessLevelPreferenceController;
 import com.android.settings.display.CameraGesturePreferenceController;
+import com.android.settings.display.DarkUIPreferenceController;
 import com.android.settings.display.LiftToWakePreferenceController;
 import com.android.settings.display.NightDisplayPreferenceController;
 import com.android.settings.display.NightModePreferenceController;
@@ -63,6 +65,12 @@
     }
 
     @Override
+    public void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+        use(DarkUIPreferenceController.class).setParentFragment(this);
+    }
+
+    @Override
     protected List<AbstractPreferenceController> createPreferenceControllers(Context context) {
         return buildPreferenceControllers(context, getSettingsLifecycle());
     }