All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=766553

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=4f5b37dd5f66bd9dfd19f29f06b0ceb8a2438544b869417126f460183715bf78


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

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

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8968030719922413920

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

Suspected Commit
  Author : Antoine Labour
  Commit : b5edb4f2db00acedc8726ba4fbdcbf03a9ae7d49
  Date   : Fri Sep 15 01:26:06 2017
  Subject: gpu: don't allow reentrancy in GpuChannelHost::Send

Bisect Details
  Configuration: mac_retina_perf_bisect
  Benchmark    : thread_times.tough_scrolling_cases
  Metric       : thread_raster_cpu_time_per_frame/canvas_05000_pixels_per_second
  Change       : 25.66% | 0.378091262824 -> 0.475128163746

Revision             Result                     N
chromium@502037      0.378091 +- 0.0472746      6       good
chromium@502084      0.396514 +- 0.0137253      6       good
chromium@502108      0.399796 +- 0.0383819      6       good
chromium@502120      0.395855 +- 0.0324149      6       good
chromium@502123      0.388391 +- 0.0241351      9       good
chromium@502124      0.475455 +- 0.0150512      6       bad       <--
chromium@502125      0.44172 +- 0.265411        14      bad
chromium@502126      0.475976 +- 0.0374368      9       bad
chromium@502131      0.475128 +- 0.0123573      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=canvas.05000.pixels.per.second thread_times.tough_scrolling_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8968030719922413920


For feedback, file a bug with component Speed>Bisection