All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=740917

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=b892005173f07b46edf86de022db457a35383aa08da814192d96dce09fdc7a27


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

android-nexus5
android-one

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8974364192334481456

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

Suspected Commit
  Author : Benedikt Meurer
  Commit : b9ee0657c6a0b7504d8bf3630e41923d5a72c71f
  Date   : Thu Jul 06 11:55:14 2017
  Subject: [builtins] Unified C++ implementation of Map and Set iterators.

Bisect Details
  Configuration: android_nexus5_perf_bisect
  Benchmark    : v8.runtimestats.browsing_mobile
  Metric       : v8-gc-incremental-step_max/browse_social/browse_social_instagram
  Change       : 163.39% | 1.60166666667 -> 4.21866666667

Revision                           Result                   N
chromium@484537                    1.60167 +- 0.685102      6       good
chromium@484587                    1.87417 +- 1.53781       6       good
chromium@484612                    1.60333 +- 0.453248      6       good
chromium@484618                    1.7825 +- 2.24244        14      good
chromium@484618,v8@124ff5322d      1.77244 +- 1.03259       9       good
chromium@484618,v8@b9ee0657c6      4.036 +- 0.634868        6       bad       <--
chromium@484618,v8@b520c6ed5e      3.44278 +- 2.72682       9       bad
chromium@484619                    3.42611 +- 3.28315       9       bad
chromium@484620                    3.60783 +- 2.26833       6       bad
chromium@484621                    3.486 +- 4.30819         13      bad
chromium@484624                    3.76813 +- 2.06941       8       bad
chromium@484636                    4.21867 +- 0.87699       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/8974364192334481456


For feedback, file a bug with component Speed>Bisection