All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=771213

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=ff911345aca2b6adbacfb8fccdc225bf87139f44fa6ef8adac7f9553718f230e


Bot(s) for this bug's original alert(s):

chromium-rel-mac-retina
chromium-rel-mac11
chromium-rel-mac11-air
chromium-rel-mac11-pro

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8966739433051827680

=== Auto-CCing suspected CL author yukiy@google.com ===

Hi yukiy@google.com, the bisect results pointed to your CL, please take a look at the
results.


=== BISECT JOB RESULTS ===
Perf regression found with culprit

Suspected Commit
  Author : yukiy
  Commit : 5d3e0c5c242477e2a2cd0beb69cd47eefbc3f38c
  Date   : Wed Sep 27 11:18:30 2017
  Subject: Update telemetry user-agent

Bisect Details
  Configuration: mac_retina_perf_bisect
  Benchmark    : smoothness.top_25_smooth
  Metric       : mean_input_event_latency/Docs  (1 open document tab)
  Change       : 14.80% | 13.729 -> 15.7613333333

Revision                                 Result                   N
chromium@504635                          13.729 +- 0.31256        6      good
chromium@504660                          13.8745 +- 0.695304      6      good
chromium@504672                          13.5315 +- 0.63962       6      good
chromium@504673                          13.6052 +- 0.415087      6      good
chromium@504673,catapult@3bc22ee407      13.4623 +- 0.552577      6      good
chromium@504673,catapult@5d3e0c5c24      15.9735 +- 0.721815      6      bad       <--
chromium@504674                          15.8168 +- 0.701113      6      bad
chromium@504675                          15.7448 +- 1.0651        6      bad
chromium@504678                          16.0353 +- 0.644406      6      bad
chromium@504684                          15.8118 +- 0.567879      6      bad
chromium@504732                          15.7613 +- 0.7466        6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=Docs...1.open.document.tab. smoothness.top_25_smooth

More information on addressing performance regressions:
  http://g.co/ChromePerformanceRegressions

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8966739433051827680


For feedback, file a bug with component Speed>Bisection

The assigned owner "yukiy@google.com" is not able to receive e-mails, please re-triage.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

moving this to Ned. Ned I think this could be just WAI as we updated the User agent string. up to you to check

WontFix since this is test change.