At the weekend, both have games against teams in the lower half of the table, but I think the clincher is April 27th, when they play each other. Chelsea are at home to Sunderland on Saturday afternoon (5:30 p.m. kick-off) and Liverpool are away to Norwich on Sunday (12:00 p.m. kick off).
I think that Liverpool are still in the box seat, because the other two games (Apart from when they play each other) are a day later than Chelsea. They know what they've got to do to lift the PL Trophy. IF they do Chelsea at Anfield, they'll have the 5-point cushion.