ref: a709b694435c23d63689f2146b2764a5bc736dd0
parent: 20103ec897f1b8cc3d44f491fc5c040b4223ea72
author: Dan Zhu <zxdan@google.com>
date: Wed Jun 19 06:54:23 EDT 2019
Add Ray Tracing Add braces Change-Id: I5355ccd8f745dfbd4fe3923a81aa3c9f8fda07b3