All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=783640

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=42a67ef38c6e181a3637a48f13e6b337b1ac40bc13c995a0498d0c236117b388


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

android-nexus5

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8963323341398984240

=== 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_idle_power_cases
  Metric       : thread_total_all_cpu_time_per_second/animated-gif.html
  Change       : 19.25% | 0.551708609221 -> 0.65790755151

Revision                           Result                    N
chromium@514611                    0.551709 +- 0.456407      14      good
chromium@514636                    0.585726 +- 0.278554      9       good
chromium@514640                    0.584265 +- 0.280054      9       good
chromium@514641                    0.586185 +- 0.278714      9       good
chromium@514641,v8@67d543ec31      0.585688 +- 0.279367      9       good
chromium@514641,v8@6bb1d47e6e      0.69011 +- 0.281221       9       bad       <--
chromium@514641,v8@ac0661b358      0.690387 +- 0.283359      9       bad
chromium@514641,v8@80cb266c75      0.698503 +- 0.285948      9       bad
chromium@514642                    0.694071 +- 0.287388      9       bad
chromium@514643                    0.694537 +- 0.283289      9       bad
chromium@514649                    0.691151 +- 0.285253      9       bad
chromium@514661                    0.688002 +- 0.279058      9       bad
chromium@514710                    0.657908 +- 0.451485      14      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=animated.gif.html thread_times.key_idle_power_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8963323341398984240


For feedback, file a bug with component Speed>Bisection