What was the original idea of Jack Warner to groom Errol into?

Errol arriving fresh from England to conquer Hollywood!

In the Golden Age of Hollywood when starlets were taken under contract the first thing studios did was to establish how to fit them into a mold to suit their movie making plans. Grooming, reinventing and molding them was prime!
So what did Jack Warner had in mind with Errol?

— Tina