All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=771576

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=965b996f98391661da1184c0b8a5d5665171ccab4faf0110f003cc8e6aedb6dc


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

android-nexus5
android-nexus5X
android-nexus7v2
android-webview-nexus5X
android-webview-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8966669379835205808

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

Suspected Commit
  Author : Ulan Degenbaev
  Commit : 7c1b01154a460dec5da40a9c8d5ae4e44eea8e4e
  Date   : Fri Sep 29 11:38:50 2017
  Subject: [heap] Enable concurrent marking on all platforms.

Bisect Details
  Configuration: android_nexus5_perf_bisect
  Benchmark    : v8.browsing_mobile
  Metric       : v8-gc-total_avg/browse_tech/browse_tech_discourse_infinite_scroll
  Change       : 95.58% | 1.30030113877 -> 2.54316116961

Revision                           Result                   N
chromium@505526                    1.3003 +- 0.320374       9      good
chromium@505547                    1.14315 +- 0.424301      6      good
chromium@505558                    1.13629 +- 0.331953      6      good
chromium@505558,v8@5005a62fe0      1.32037 +- 0.283342      6      good
chromium@505558,v8@7c1b01154a      3.2825 +- 0.84569        6      bad       <--
chromium@505559                    2.80708 +- 1.72559       6      bad
chromium@505560                    2.64223 +- 2.4357        9      bad
chromium@505561                    2.84677 +- 1.45938       6      bad
chromium@505563                    2.68213 +- 1.41329       6      bad
chromium@505568                    2.54316 +- 2.1538        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.tech.discourse.infinite.scroll v8.browsing_mobile

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8966669379835205808


For feedback, file a bug with component Speed>Bisection