gtk/style.go
func (v *StyleContext) AddProvider(provider IStyleProvider, prio uint) {
	C.gtk_style_context_add_provider(v.native(), provider.toStyleProvider(), C.guint(prio))
}
func (v *StyleContext) AddProvider(provider IStyleProvider, prio uint) {
	C.gtk_style_context_add_provider(v.native(), provider.toStyleProvider(), C.guint(prio))
}
// AddProvider is a wrapper around gtk_style_context_add_provider().