All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=792448

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=68e39f4ad8b2b1d832e4d352055ece3954e1136cd0e12e7ae75e3431abbf89e8


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

android-nexus5
android-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8960949501920394704

=== 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    : thread_times.key_silk_cases
  Metric       : thread_GPU_cpu_time_per_frame/http___jsfiddle.net_vBQHH_11_show_
  Change       : 49.36% | 9.1064830585 -> 13.6013928139

Revision             Result                   N
chromium@521468      9.10648 +- 0.23385       6      good
chromium@521533      8.9241 +- 0.236994       6      good
chromium@521565      9.11569 +- 0.425806      6      good
chromium@521581      9.02759 +- 0.583822      6      good
chromium@521585      9.09813 +- 0.630981      6      good
chromium@521586      13.4905 +- 0.349707      6      bad       <--
chromium@521587      13.5859 +- 0.434635      6      bad
chromium@521589      13.6281 +- 0.611509      6      bad
chromium@521597      13.6014 +- 0.706302      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.vBQHH.11.show. thread_times.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/8960949501920394704


For feedback, file a bug with component Speed>Bisection