Trying to green the obbs bot

BUG=chromium:786430

Change-Id: I6e7b2878295566a15f482f932d0ba033e38daab2
Reviewed-on: https://chromium-review.googlesource.com/777029
Commit-Queue: Ashley Enstad <ashleymarie@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#517528}

tools/perf/core/merge_script.py

@@ -38,6 +38,7 @@ def main():
   parser.add_argument('-o', '--output-json', required=True)
   parser.add_argument('--build-properties', help=argparse.SUPPRESS)
   parser.add_argument('--summary-json', help=argparse.SUPPRESS)
+  parser.add_argument('--verbose', help=argparse.SUPPRESS)
   parser.add_argument('jsons_to_merge', nargs='*')
 
   args = parser.parse_args()