buildbot: Log builds which have more than 2m ingest latency
buildbot: Log builds which have more than 2m ingest latency

BUG=skia:4268

Review URL: https://codereview.chromium.org/1588533003

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