A Dose Escalation Study of Glofitamab (RO7082859) as a Single Agent and in Combination With Obinutuzumab, Administered After a Fixed, Single Pre-treatment Dose of Obinutuzumab in Participants With Relapsed/Refractory B-cell Non-hodgkin's Lymphoma

Inclusion Criteria: * Depending upon study part, a history or status of: 1) a histologically-confirmed hematological malignancy that is expected to express cluster of differentiation (CD)20; 2) relapse after or failure to respond to at least one prior treatment regimen; and 3) no available treatment options that are expected to prolong survival (e.g., standard chemotherapy or autologous stem cell transplant \[ASCT\]) * Measurable disease, defined as at least one bi-dimensionally measurable nodal lesion, defined as \> 1.5 cm in its longest dimension, or at least one bi-dimensionally measurable extranodal lesion, defined as \> 1.0 cm in its longest dimension * Able to provide a tumor tissue pretreatment biopsy at last relapse or during screening from a safely accessible site, per investigator determination, providing the patient has more than one measurable target lesion * Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 * Life expectancy of \>/=12 weeks * AEs from prior anti-cancer therapy must have resolved to Grade less than or equal to (\</=) 1 * Adequate liver, hematological and renal function * Negative serologic or polymerase chain reaction (PCR) test results for acute or chronic Hepatitis B virus (HBV) infection * Negative test results for Hepatitis C virus (HCV) and human immunodeficiency virus (HIV) * Negative serum pregnancy test within 7 days prior to study treatment in women of childbearing potential. Women who are not of childbearing potenti…