All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=799621

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=5a1d5eb29fa1beea146750b89170ac3dfedf7b8b27ddd92acbe988e65aae633f


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

android-nexus5

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8958198105478229616

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

Suspected Commit
  Author : Chris Harrelson
  Commit : d45f384824617447c7e4e8808b4946230dab58e2
  Date   : Sat Dec 30 01:02:37 2017
  Subject: Revert "Revert "[CI] Migrate hit-testing code in PaintLayer to use GeometryMapper.""

Bisect Details
  Configuration: android_nexus5_perf_bisect
  Benchmark    : smoothness.sync_scroll.key_mobile_sites_smooth
  Metric       : mean_input_event_latency/http___www.sfgate.com_
  Change       : 21.40% | 16.9721666667 -> 20.6046666667

Revision             Result                   N
chromium@526393      16.9722 +- 1.23261       6      good
chromium@526397      17.2603 +- 1.29392       6      good
chromium@526399      16.859 +- 1.52651        6      good
chromium@526400      20.7678 +- 1.56675       6      bad       <--
chromium@526406      20.6047 +- 0.791756      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...www.sfgate.com. smoothness.sync_scroll.key_mobile_sites_smooth

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8958198105478229616


For feedback, file a bug with component Speed>Bisection