All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=760631

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=03a01e178758496b904c08676a3c72dcb89247d8607d6791b3e028e134448130


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

chromium-rel-mac11
chromium-rel-win8-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8969816007898215888

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

Suspected Commit
  Author : Robert Sesek
  Commit : 5cd8eef498e28e1aacb9109645c001bbbfe1bc26
  Date   : Mon Aug 28 19:51:25 2017
  Subject: [Mac] A potential fix for WaitableEvent::WaitMany on macOS 10.11.

Bisect Details
  Configuration: mac_10_11_perf_bisect
  Benchmark    : media.tough_video_cases
  Metric       : seek/video.html?src_tulip2.wav_type_audio_seek
  Change       : 11.15% | 1.8 -> 1.96916666667

Revision             Result                   N
chromium@497844      1.8 +- 0.313369          9       good
chromium@497849      1.78667 +- 0.213268      6       good
chromium@497850      1.97833 +- 0.163656      6       bad       <--
chromium@497851      2.00583 +- 0.343833      6       bad
chromium@497853      1.96278 +- 0.281257      9       bad
chromium@497861      1.95393 +- 0.510303      14      bad
chromium@497877      2.02444 +- 0.376527      9       bad
chromium@497909      2.01 +- 0.602993         9       bad
chromium@497974      1.96917 +- 0.203152      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=video.html.src.tulip2.wav.type.audio.seek media.tough_video_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8969816007898215888


For feedback, file a bug with component Speed>Bisection