[skiacorrectness] main.go: Get token source via auth.NewGCloudTokenSource() when running with --local.
[skiacorrectness] main.go: Get token source via auth.NewGCloudTokenSource() when running with --local.

Change-Id: I46175ba6782c86a3e44a7ebde21c63aa43d6224d
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/234057
Reviewed-by: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>
Reviewed-by: Ben Wagner aka dogben <3ef7217be91069877d94f7907ce5479000772cd3@google.com>
Commit-Queue: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>

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