func WithCredentials(creds *google.Credentials) ClientOption {
	return (*withCreds)(creds)
}
WithCredentials returns a ClientOption that authenticates API calls.
package option
import (
	"golang.org/x/oauth2/google"
	"google.golang.org/api/internal"
)
type withCreds google.Credentials
func (w *withCreds) Apply(o *internal.DialSettings) {
	o.Credentials = (*google.Credentials)(w)
}