Adding some widget addition flow tests

> Added two dummy widget providers: with config and without config
> Added tests for verify widget config flow

Change-Id: I4577f085abe8f8b82047b644c71cc9065358153a
diff --git a/src/com/android/launcher3/FolderInfo.java b/src/com/android/launcher3/FolderInfo.java
index 4c88e7e..5fff2e7 100644
--- a/src/com/android/launcher3/FolderInfo.java
+++ b/src/com/android/launcher3/FolderInfo.java
@@ -93,7 +93,7 @@
     }
 
     @Override
-    void onAddToDatabase(ContentWriter writer) {
+    public void onAddToDatabase(ContentWriter writer) {
         super.onAddToDatabase(writer);
         writer.put(LauncherSettings.Favorites.TITLE, title)
                 .put(LauncherSettings.Favorites.OPTIONS, options);