All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=788378

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=b6287c331b083b792a165ebafeba84a7b4e95e6032669319f41be94c4a0bc829


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

android-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8962042201381030960

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

Suspected Commit
  Author : Ian Kilpatrick
  Commit : 98b46470f307a68c8183d628237d7b361af96244
  Date   : Tue Nov 21 01:22:24 2017
  Subject: Add secure_context_mode_ to CSSParserContext.

Bisect Details
  Configuration: android_nexus6_perf_bisect
  Benchmark    : smoothness.tough_animation_cases
  Metric       : frame_times/balls_javascript_css.html
  Change       : 16.45% | 358.748260392 -> 417.769635447

Revision             Result                  N
chromium@517888      358.748 +- 7.08936      6      good
chromium@517975      360.64 +- 7.08257       6      good
chromium@517997      357.379 +- 3.86787      6      good
chromium@518008      358.398 +- 16.9561      6      good
chromium@518013      356.092 +- 10.6519      6      good
chromium@518015      358.395 +- 5.83982      6      good
chromium@518016      412.58 +- 6.73838       6      bad       <--
chromium@518018      411.136 +- 8.43608      6      bad
chromium@518061      417.77 +- 5.08425       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=balls.javascript.css.html smoothness.tough_animation_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8962042201381030960


For feedback, file a bug with component Speed>Bisection