All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=792460

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=ab6f3a695e34ea017e95c1b7f66aeb51c25621a31a094a95aa0f7ea6c0200440


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

android-webview-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8960949238980827904

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

Suspected Commit
  Author : Chris Harrelson
  Commit : a3e4477c29d087d3708dbcb4dc5a90985c2b45e3
  Date   : Tue Dec 05 01:51:58 2017
  Subject: [PE] Turn on half-width tiles for all platforms and devices.

Bisect Details
  Configuration: android_webview_nexus6_aosp_perf_bisect
  Benchmark    : smoothness.tough_animation_cases
  Metric       : frame_times/css_value_type_shadow.html?api_css_animations_N_0316
  Change       : 7.35% | 204.092144715 -> 219.08763717

Revision             Result                  N
chromium@521570      204.092 +- 5.14376      6      good
chromium@521581      203.631 +- 6.4691       6      good
chromium@521584      203.036 +- 4.11661      6      good
chromium@521585      203.717 +- 8.51694      6      good
chromium@521586      218.143 +- 6.30989      6      bad       <--
chromium@521591      217.458 +- 11.1847      6      bad
chromium@521612      219.088 +- 13.2934      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-webview --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=css.value.type.shadow.html.api.css.animations.N.0316 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/8960949238980827904


For feedback, file a bug with component Speed>Bisection