All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=776296

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=0abcf2e0a2f6211a5c7de7e3cbd1446203aadd6493fef2b7b577e11a2f9b3d55


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

chromium-rel-win10
win-high-dpi

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8965319725097197024

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

Suspected Commit
  Author : Michael Lippautz
  Commit : 4b42656dd6fca982c60185c004e2648093d70b51
  Date   : Mon Oct 16 10:00:08 2017
  Subject: [heap] Unify incremental and main marking visitor

Bisect Details
  Configuration: winx64_high_dpi_perf_bisect
  Benchmark    : v8.browsing_desktop
  Metric       : v8-gc-incremental-step_max/browse_media/browse_media_youtube
  Change       : 85.15% | 6.63666666667 -> 12.288

Revision                           Result                   N
chromium@509125                    6.63667 +- 2.41715       6      good
chromium@509166                    7.09617 +- 3.66057       6      good
chromium@509176                    7.32733 +- 4.44019       6      good
chromium@509181                    6.86233 +- 0.667944      6      good
chromium@509184                    6.49217 +- 3.97404       6      good
chromium@509185                    7.3935 +- 1.70151        6      good
chromium@509185,v8@4b42656dd6      13.9277 +- 1.62518       6      bad       <--
chromium@509185,v8@089dd7d244      13.6222 +- 1.76243       6      bad
chromium@509185,v8@5820041884      13.5675 +- 4.33912       6      bad
chromium@509185,v8@e659f45610      12.2682 +- 2.30572       6      bad
chromium@509185,v8@af49af006f      12.8253 +- 2.3405        6      bad
chromium@509186                    12.8065 +- 2.09283       6      bad
chromium@509206                    12.288 +- 3.39072        6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=browse.media.youtube v8.browsing_desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8965319725097197024


For feedback, file a bug with component Speed>Bisection