All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=758987

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=cb0ac83bb16b736e630d2f4d9fbb414d052c0188e3b9a0f3d7fa2036897af6fa


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

chromium-rel-mac11
chromium-rel-mac11-pro
chromium-rel-win10
chromium-rel-win7-gpu-intel
chromium-rel-win7-gpu-nvidia
chromium-rel-win7-x64-dual
chromium-rel-win8-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8970283748080445520

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

Suspected Commit
  Author : Michael Hablich
  Commit : af91eb85de58d9205f029da39662740ca7c222f2
  Date   : Wed Aug 23 10:18:57 2017
  Subject: Version 6.2.337.1 (cherry-pick)

Bisect Details
  Configuration: mac_pro_perf_bisect
  Benchmark    : v8.runtimestats.browsing_desktop
  Metric       : Optimize:duration_avg/browse_social/browse_social_tumblr_infinite_scroll
  Change       : 9810.09% | 0.0578333333333 -> 5.73133333333

Revision                           Result                      N
chromium@496123                    0.0578333 +- 0.0678589      6      good
chromium@496416                    0.0433333 +- 0.0696372      6      good
chromium@496563                    0.045 +- 0.147811           6      good
chromium@496636                    0.0358333 +- 0.0921674      6      good
chromium@496655                    0.0361667 +- 0.0914376      6      good
chromium@496660                    0.069 +- 0.0167929          6      good
chromium@496661                    0.0398333 +- 0.069461       6      good
chromium@496661,v8@af91eb85de      6.37883 +- 2.84837          6      bad       <--
chromium@496662                    6.80367 +- 1.38106          6      bad
chromium@496664                    6.351 +- 2.7982             6      bad
chromium@496673                    6.43633 +- 2.42919          6      bad
chromium@496709                    5.73133 +- 2.00699          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=browse.social.tumblr.infinite.scroll v8.runtimestats.browsing_desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8970283748080445520


For feedback, file a bug with component Speed>Bisection