A Study of Atezolizumab in Participants With Programmed Death-Ligand 1 (PD-L1) Positive Locally Advanced or Metastatic Non-Small Cell Lung Cancer (NSCLC) [FIR]

Inclusion Criteria: * Stage IIIB (not eligible for definitive chemoradiotherapy), Stage IV, or recurrent NSCLC * PDL1-positive status as determined by an immunohistochemistry assay performed by a central laboratory. A positive result in chemotherapy, chemoradiation of the tumor sample biopsy will satisfy the eligibility criterion * Eastern Cooperative Oncology group Performance Status of 0 or 1 * Life expectancy greater than or equal to 12 weeks * Measurable disease, as defined by Response Evaluation Criteria in Solid Tumors Version 1.1 * Adequate hematologic and end organ function Exclusion Criteria: * Any approved anti-cancer therapy, including chemotherapy, or hormonal therapy within 3 weeks prior to initiation of study treatment; the following exceptions are allowed. Hormone-replacement therapy or oral contraceptives, and tyrosine kinase inhibitors approved for treatment of NSCLC discontinued greater than 7 days prior to Cycle 1 Day 1 * Treatment with any other investigational agent or participation in another clinical trial with therapeutic intent within 28 days prior to enrollment * Known central nervous system disease, including treated brain metastases in the following participants: 1. who will not receive prior chemotherapy for advanced disease 2. who progress during or following a prior-platinum based chemotherapy regimen for advanced disease (referred as 2L+ participants) * Participants with a history of treated asymptomatic brain metastases are allowed in the 2L+ participants and previously treated for brain metastases. * Leptomeningeal disease * Uncontrolled tumor-related pain * Uncontrolled hypercalcemia