All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=766541

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=daee8efa9727da531c1c1ee3621972f3856d05aa98b111850a1003a30a147908


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

android-nexus7v2
android-one

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8968030900806329376

=== Auto-CCing suspected CL author timloh@chromium.org ===

Hi timloh@chromium.org, the bisect results pointed to your CL, please take a look at the
results.


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

Suspected Commit
  Author : Timothy Loh
  Commit : e1ef417340c9ebfe3613c90b636f74f96c9efc4b
  Date   : Thu Sep 14 03:31:59 2017
  Subject: Enable modal permission prompts on android

Bisect Details
  Configuration: android_nexus7_perf_bisect
  Benchmark    : smoothness.sync_scroll.key_mobile_sites_smooth
  Metric       : frame_times/https___www.google.co.uk_search?hl_en_q_barack+obama_cad_h
  Change       : 55.55% | 24.6211110434 -> 38.2988618608

Revision             Result                  N
chromium@501773      24.6211 +- 2.98044      6      good
chromium@501818      23.7972 +- 4.08638      6      good
chromium@501841      24.5155 +- 5.33104      6      good
chromium@501852      25.0555 +- 6.83317      6      good
chromium@501858      23.5984 +- 10.9565      6      good
chromium@501859      39.0513 +- 14.5551      6      bad       <--
chromium@501860      45.1836 +- 24.2251      6      bad
chromium@501861      40.9536 +- 18.6432      6      bad
chromium@501863      38.2989 +- 11.331       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=https...www.google.co.uk.search.hl.en.q.barack.obama.cad.h 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/8968030900806329376


For feedback, file a bug with component Speed>Bisection

 Issue 766543  has been merged into this issue.

 Issue 766549  has been merged into this issue.

 Issue 766545  has been merged into this issue.

Probably fixed by https://bugs.chromium.org/p/chromium/issues/detail?id=760901#c20, will check back in a while.