tree d0e320542edd18e057d9d88babfb9955f934705f
parent fc56ce1fccf162eed95bbee9147402126020ef78
author renjietang <renjietang@google.com> 1591136380 -0700
committer Copybara-Service <copybara-worker@google.com> 1591136424 -0700

Add << operator for TransmissionType to make debugging easier.

No behavior change. not protected.

PiperOrigin-RevId: 314414563
Change-Id: Ia1d4afe900565d6cd9bdcdf39a33cce227a2b5fb