This is an investigational study. Bevacizumab is FDA approved and commercially available to treat certain types of cervical, ovarian, Fallopian tube, peritoneal, colorectal, lung, brain, and kidney cancer. Atezolizumab is FDA approved and commercially available to treat certain types of lung and urinary system cancer. The combination of bevacizumab and atezolizumab is investigational. The study doctor can explain how the study drugs are designed to work.