All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=771549

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=1fd816787bad885ff2a806cb6ab264ebdfe5185aafbae6fbd744d9af9dfb18a0


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

android-nexus5X

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8966675787908398096

=== 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_nexus5X_perf_bisect
  Benchmark    : v8.runtimestats.browsing_mobile
  Metric       : v8-gc-total_avg/browse_media/browse_media_facebook_photos
  Change       : 34.29% | 0.961800369205 -> 1.29160912158

Revision                           Result                    N
chromium@505556                    0.9618 +- 0.139271        6      good
chromium@505558                    0.959275 +- 0.195204      6      good
chromium@505558,v8@5005a62fe0      0.975798 +- 0.115373      6      good
chromium@505558,v8@7c1b01154a      1.42557 +- 0.244658       6      bad       <--
chromium@505559                    1.33486 +- 0.0887655      6      bad
chromium@505562                    1.37374 +- 0.176539       6      bad
chromium@505568                    1.40277 +- 0.22876        6      bad
chromium@505592                    1.29161 +- 0.267305       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.media.facebook.photos 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/8966675787908398096


For feedback, file a bug with component Speed>Bisection