All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=792909

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=d86a18fff1c4934e9c5e4d00663682b548ae7cf7814b5f0c6218520c7634a55c


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

android-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8960855372108264288

=== 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    : system_health.common_mobile
  Metric       : cpu_time_percentage_avg/browse_news/browse_news_washingtonpost
  Change       : 4.14% | 0.544980361634 -> 0.567534198263

Revision             Result                      N
chromium@521468      0.54498 +- 0.00615257       6      good
chromium@521533      0.543734 +- 0.00831658      6      good
chromium@521565      0.543133 +- 0.0113938       6      good
chromium@521581      0.546642 +- 0.00908399      6      good
chromium@521585      0.543733 +- 0.00745316      6      good
chromium@521586      0.566564 +- 0.00706645      6      bad       <--
chromium@521587      0.568239 +- 0.0111078       6      bad
chromium@521589      0.569284 +- 0.00385444      6      bad
chromium@521597      0.567534 +- 0.00679203      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=browse.news.washingtonpost system_health.common_mobile

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8960855372108264288


For feedback, file a bug with component Speed>Bisection