All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=787449

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=0edfd51de1fdf3e58be888df88a01cf64bfda76ec2467a08b1715dc59fce3948


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

chromium-rel-win7-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8962310517900548608

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

Suspected Commit
  Author : Nghia Nguyen
  Commit : 564e33d345ee080be36ad0e6b6107afbcd09df4d
  Date   : Tue Nov 07 14:06:23 2017
  Subject: Update wprgo binaries to latest version

Bisect Details
  Configuration: win_perf_bisect
  Benchmark    : v8.browsing_desktop
  Metric       : total:500ms_window:renderer_eqt:v8_max/browse_media/browse_media_pinterest
  Change       : 22.94% | 241.476922439 -> 296.870555555

Revision                                 Result                  N
chromium@515146                          241.477 +- 800.581      14      good
chromium@515148                          156.149 +- 14.7007      6       good
chromium@515148,catapult@a7fb6add75      159.886 +- 35.5654      6       good
chromium@515148,catapult@b33d83ad5d      158.365 +- 6.4941       6       good
chromium@515148,catapult@564e33d345      275.342 +- 50.1068      6       bad       <--
chromium@515148,catapult@c169bba255      279.501 +- 68.0494      6       bad
chromium@515149                          315.861 +- 67.591       6       bad
chromium@515150                          295.867 +- 77.7827      9       bad
chromium@515153                          299.253 +- 163.882      9       bad
chromium@515159                          288.119 +- 86.2906      9       bad
chromium@515172                          319.618 +- 251.713      9       bad
chromium@515198                          296.871 +- 62.1365      9       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=browse.media.pinterest 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/8962310517900548608


For feedback, file a bug with component Speed>Bisection