All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=770814

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=4fc66e755abedd26c76c50dd5a8c44f2a6beccd77cbf3d1fe2948fcad9bcb339


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

android-nexus5

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8966817675548224448

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

Suspected Commit
  Author : Marja Hölttä
  Commit : 40856948a64e2b76bc121a8841a763836dbf1b37
  Date   : Thu Sep 28 12:41:56 2017
  Subject: [parser] Skipping inner funcs: Turn off FLAG_preparser_scope_analysis.

Bisect Details
  Configuration: android_nexus5_perf_bisect
  Benchmark    : v8.runtimestats.browsing_mobile
  Metric       : Parse:duration_avg/browse_social/browse_social_instagram
  Change       : 54.69% | 589.023333333 -> 911.165166667

Revision                           Result                  N
chromium@504931                    589.023 +- 39.9095      6      good
chromium@505123                    596.907 +- 36.7036      5      good
chromium@505171                    585.003 +- 7.87611      6      good
chromium@505195                    595.537 +- 30.246       6      good
chromium@505207                    594.679 +- 46.0144      6      good
chromium@505210                    591.359 +- 8.64674      6      good
chromium@505210,v8@4ba6f15ece      590.882 +- 27.8073      6      good
chromium@505210,v8@40856948a6      902.605 +- 35.9289      6      bad       <--
chromium@505210,v8@193dcf7693      898.132 +- 35.7351      6      bad
chromium@505210,v8@e1cdda2512      905.243 +- 22.5914      6      bad
chromium@505211                    900.058 +- 27.506       6      bad
chromium@505212                    900.105 +- 24.645       6      bad
chromium@505213                    909.633 +- 37.7545      6      bad
chromium@505219                    900.808 +- 26.727       6      bad
chromium@505315                    911.165 +- 38.2469      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=browse.social.instagram v8.runtimestats.browsing_mobile

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8966817675548224448


For feedback, file a bug with component Speed>Bisection