PROVIDENCE, R.I. — If officials and voters give their blessing to a new Tiverton casino, the state's share of gambling revenue could increase by $17.8 million over five years, according to a new gambling revenue forecast prepared for the state.The study prepared by Christiansen Capital Advisors predicts the state's share of gambling revenues will grow from $295 million in fiscal 2016 to $312.8 million in fiscal 2021 — or an increase of 6 percent — if the Newport [...]