All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=792456

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=49d09ee297b00985e1e85b91b53bb76256fb49c5887f2461b3e87255a8478fb2


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

android-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8960949318132680336

=== 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_nexus6_perf_bisect
  Benchmark    : smoothness.key_silk_cases
  Metric       : mean_frame_time/http___jsfiddle.net_xLuvC_1_show_
  Change       : 22.16% | 26.7738333333 -> 32.7081666667

Revision             Result                   N
chromium@521468      26.7738 +- 0.204594      6      good
chromium@521533      26.6768 +- 0.544183      6      good
chromium@521565      26.8088 +- 0.531465      6      good
chromium@521581      26.8093 +- 0.662516      6      good
chromium@521585      26.5538 +- 0.49699       6      good
chromium@521586      33.1818 +- 1.26268       6      bad       <--
chromium@521587      32.821 +- 0.889029       6      bad
chromium@521589      32.5173 +- 0.970298      6      bad
chromium@521597      32.7082 +- 2.20768       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...jsfiddle.net.xLuvC.1.show. smoothness.key_silk_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8960949318132680336


For feedback, file a bug with component Speed>Bisection