Add cdalton@nvidia.com to trybot list
Add cdalton@nvidia.com to trybot list

R=rmistry@google.com, hcm@google.com

Author: jvanverth@google.com

Review URL: https://codereview.chromium.org/586733002

google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot