All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=778664

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=57e0abfa0eb54e654c220236ac140a78a57fe43145e0ff86fc92babb4cca341b


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

android-nexus5

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8964664965545976784

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

Suspected Commit
  Author : Alexei Filippov
  Commit : d0cf729782cf311d39d3b8934ef150ccf3ef9127
  Date   : Thu Oct 19 18:21:02 2017
  Subject: [runtime-call-stats] Temporarily change DCHECK to CHECK in RCS::Enter and LEAVE

Bisect Details
  Configuration: android_nexus5_perf_bisect
  Benchmark    : v8.runtimestats.browsing_mobile
  Metric       : Total:duration_avg/browse_social/browse_social_instagram
  Change       : 1.40% | 23263.1976667 -> 23576.182

Revision                           Result                  N
chromium@510347                    23263.2 +- 295.895      6       good
chromium@510374                    23284.4 +- 447.909      9       good
chromium@510381                    23235.2 +- 336.06       6       good
chromium@510382                    23259.4 +- 357.808      6       good
chromium@510382,v8@0454a842d1      23298.2 +- 527.274      9       good
chromium@510382,v8@9b51519e52      23235.5 +- 100.315      6       good
chromium@510382,v8@f65251be3c      23290.1 +- 201.77       6       good
chromium@510382,v8@d0cf729782      23644.8 +- 259.952      6       bad       <--
chromium@510383                    23686.2 +- 408.173      6       bad
chromium@510385                    23622.1 +- 181.834      6       bad
chromium@510388                    23584.3 +- 725.234      14      bad
chromium@510401                    23576.2 +- 405.639      9       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/8964664965545976784


For feedback, file a bug with component Speed>Bisection