All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=771551

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=f1e7e635def9c80f82750c75cec7bc91419a5ee01545962f99949c0b43ebeb46


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

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

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8966675136940847232

=== 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_nexus7_perf_bisect
  Benchmark    : v8.runtimestats.browsing_mobile
  Metric       : v8-gc-incremental-start_sum/browse_media/browse_media_flickr_infinite_scroll
  Change       : 265.32% | 0.600166666667 -> 2.1925

Revision                           Result                     N
chromium@505546                    0.600167 +- 0.0555053      6      good
chromium@505556                    0.569333 +- 0.134563       6      good
chromium@505558                    0.615333 +- 0.0514911      6      good
chromium@505558,v8@5005a62fe0      0.615667 +- 0.0277729      6      good
chromium@505558,v8@7c1b01154a      2.192 +- 0.0795739         6      bad       <--
chromium@505559                    1.37817 +- 1.21108         6      bad
chromium@505561                    1.836 +- 1.22134           6      bad
chromium@505565                    2.1925 +- 0.109861         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.flickr.infinite.scroll 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/8966675136940847232


For feedback, file a bug with component Speed>Bisection