All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=846672

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=ff82d45fba32ec280f5ad1a21ab53e5a9c89a07cff34f148ae4aaa38c668e7ac


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

perf-go-phone-1024
perf-go-phone-512

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8945556656213261344

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

Suspected Commit
  Author : jgruber
  Commit : e0c3f6d6ca005185e537fb85bbe841fe5dae5240
  Date   : Tue May 08 11:21:37 2018
  Subject: Disable embedded builtins

Bisect Details
  Configuration: go-phone-1024-perf-bisect
  Benchmark    : system_health.memory_mobile
  Metric       : memory:chrome:all_processes:reported_by_chrome:v8:effective_size_avg/load_media/load_media_soundcloud
  Change       : 12.88% | 3049936.0 -> 3442800.66667

Revision                                                     Result                  N
android-chrome@df6203e427                                    3049936 +- 60368.2      6      good
android-chrome@be902aa047                                    2973769 +- 34190.8      6      good
android-chrome@be902aa047,chromium@556849                    2972579 +- 29158.8      6      good
android-chrome@be902aa047,chromium@556890                    2987613 +- 38421.2      6      good
android-chrome@be902aa047,chromium@556893                    2997145 +- 40599.7      6      good
android-chrome@be902aa047,chromium@556894                    3009230 +- 36652.4      6      good
android-chrome@be902aa047,chromium@556894,v8@855850eb7f      2960465 +- 18627.1      6      good
android-chrome@be902aa047,chromium@556894,v8@e0c3f6d6ca      3392749 +- 40522.7      6      bad       <--
android-chrome@be902aa047,chromium@556894,v8@c34562803e      3399882 +- 38194.9      6      bad
android-chrome@be902aa047,chromium@556894,v8@9f5018c9b0      3379040 +- 13480.0      6      bad
android-chrome@be902aa047,chromium@556894,v8@61af2762ef      3412332 +- 51273.5      6      bad
android-chrome@be902aa047,chromium@556895                    3449500 +- 37374.3      6      bad
android-chrome@be902aa047,chromium@556901                    3415534 +- 38168.9      6      bad
android-chrome@be902aa047,chromium@556911                    3384092 +- 16626.5      6      bad
android-chrome@1390428f76                                    3396318 +- 51794.5      6      bad
android-chrome@41db54dacb                                    3410365 +- 33517.1      6      bad
android-chrome@915f491ece                                    3419638 +- 37473.3      6      bad
android-chrome@1517972687                                    3408496 +- 50156.0      6      bad
android-chrome@a03058257f                                    3431742 +- 30565.7      6      bad
android-chrome@e65cccf457                                    3430237 +- 75030.7      6      bad
android-chrome@4426288b2b                                    3442801 +- 38669.3      6      bad

Please refer to the following doc on diagnosing memory regressions:
  https://chromium.googlesource.com/chromium/src/+/master/docs/memory-infra/memory_benchmarks.md

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-chrome --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=load.media.soundcloud system_health.memory_mobile

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8945556656213261344


For feedback, file a bug with component Speed>Bisection