All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=783683

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=4288dc0222e244cd94c660e58506d7870a6604938e662c6a72d7197234b483c4


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

android-nexus5
android-nexus7v2

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8963319703420145312

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

Suspected Commit
  Author : Ulan Degenbaev
  Commit : 6bb1d47e6e82f75ead36cdab209afc5dafa8329c
  Date   : Tue Nov 07 13:11:10 2017
  Subject: [heap] Re-enable concurrent marking.

Bisect Details
  Configuration: android_nexus5_perf_bisect
  Benchmark    : thread_times.key_silk_cases
  Metric       : thread_other_cpu_time_per_frame/http___wiltzius.github.io_shape-shifter_
  Change       : 52.21% | 0.418198680558 -> 0.636532183602

Revision                           Result                     N
chromium@514611                    0.418199 +- 0.0304675      6      good
chromium@514636                    0.412591 +- 0.0218944      6      good
chromium@514640                    0.409969 +- 0.0213402      6      good
chromium@514641                    0.408874 +- 0.0148198      6      good
chromium@514641,v8@67d543ec31      0.412901 +- 0.024361       6      good
chromium@514641,v8@6bb1d47e6e      0.620653 +- 0.107538       6      bad       <--
chromium@514641,v8@ac0661b358      0.619519 +- 0.113122       6      bad
chromium@514641,v8@80cb266c75      0.620488 +- 0.110284       6      bad
chromium@514642                    0.643044 +- 0.0493031      6      bad
chromium@514643                    0.655473 +- 0.0359432      6      bad
chromium@514649                    0.655517 +- 0.0443933      6      bad
chromium@514661                    0.646818 +- 0.0683696      6      bad
chromium@514710                    0.636532 +- 0.023437       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=http...wiltzius.github.io.shape.shifter. thread_times.key_silk_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8963319703420145312


For feedback, file a bug with component Speed>Bisection