Perf - Add command-line application to generate PubSub events.
Perf - Add command-line application to generate PubSub events.

Used to trigger Perf ingestion.

Bug: skia:
Change-Id: I8e81c5dfa0af293fa0d2bf9a5296e534c7b611ba
Reviewed-on: https://skia-review.googlesource.com/157926
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@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