Create an overlay to add a photo and video deletion helper service.

This overlay defines a checkbox preference in the deletion helper for
facilitating the deletion of photos and videos. The service which
provides deletion clearing can be overridden and used to create a
custom photo and video deletion helper.

Bug: 28554187
Bug: 28560856

Change-Id: Id5d9671a307aaac0d1331f055b8f2ab7aa67977c

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

@@ -61,6 +61,11 @@ public abstract class FeatureFactory {
 
     public abstract SupportFeatureProvider getSupportFeatureProvider(Context context);
 
+    /**
+     * Return a provider which adds additional deletion services to the Deletion Helper.
+     */
+    public abstract DeletionHelperFeatureProvider getDeletionHelperFeatureProvider();
+
     public static final class FactoryNotFoundException extends RuntimeException {
         public FactoryNotFoundException(Throwable throwable) {
             super("Unable to create factory. Did you misconfigure Proguard?", throwable);