DoorDash, Inc. (NASDAQ:DASH) shares are trading higher on Thursday as the company expands its presence into the autonomous delivery space through a new collaboration with Waymo, the self-driving unit of Alphabet Inc. (NASDAQ:GOOGL).The two companies are launching an autonomous delivery pilot in Metro Phoenix and offering a special promotion to DashPass members in select U.S. cities.Testing for the self-driving delivery initiative has already begun in Metro Phoenix, where select customers may soon receive th ...