Fiat Chrysler Automobiles (NYSE: FCAU) and Waymo, the self-driving subsidiary of Alphabet (NASDAQ: GOOG) (NASDAQ: GOOGL), said that they have expanded their partnership with an agreement to add tens of thousands of Chrysler minivans to Waymo's self-driving fleet. Waymo and FCA are also looking at incorporating Waymo's self-driving technology in an FCA vehicle that would be available to retail customers, the companies said.The news comes a day before FCA is expected to reveal its business plan for the next five years -- and just hours after Waymo rival GM Cruise announced a major investment from a high-profile technology fund.