All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=750914

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=64dc2f36c6e400b7b67a3f1c317e8c1ad4bdb16b8205bb91225f2baa7d668776


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

chromium-rel-mac-retina

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8972511882980046528

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

Suspected Commit
  Author : Sunny Sachanandani
  Commit : 70d14d2a335c81fb2e8d35db453d58de423c726d
  Date   : Wed Jul 26 06:03:59 2017
  Subject: Reland of gpu: Allow empty sync tokens in mailboxes.

Bisect Details
  Configuration: mac_retina_perf_bisect
  Benchmark    : media.tough_video_cases_tbmv2
  Metric       : cpu_time_percentage_avg/video.html?src_crowd1080.mp4
  Change       : 6.50% | 0.24802140412 -> 0.264153783977

Revision             Result                      N
chromium@489552      0.248021 +- 0.00943732      6      good
chromium@489558      0.250628 +- 0.00852156      6      good
chromium@489561      0.250064 +- 0.00348091      6      good
chromium@489562      0.249278 +- 0.00875714      6      good
chromium@489563      0.26314 +- 0.00936671       6      bad       <--
chromium@489573      0.266535 +- 0.00649087      6      bad
chromium@489593      0.264154 +- 0.00387239      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.crowd1080.mp4 media.tough_video_cases_tbmv2

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8972511882980046528


For feedback, file a bug with component Speed>Bisection