All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=798608

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=c2d8bc19a1b4d7bdbf4a6c4d06012199ea5630d9298397f686b9aa14c7d2dfe9


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

android-nexus5
android-nexus6
android-webview-nexus5X

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8958465985384682192

=== 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.simple_mobile_sites
  Metric       : thread_raster_cpu_time_per_frame/http___www.nyc.gov
  Change       : 16.02% | 0.241797859517 -> 0.280532151053

Revision             Result                     N
chromium@521468      0.241798 +- 0.014633       6      good
chromium@521533      0.245733 +- 0.0128668      6      good
chromium@521565      0.238611 +- 0.0149402      6      good
chromium@521581      0.241665 +- 0.0107113      6      good
chromium@521585      0.238947 +- 0.0108164      6      good
chromium@521586      0.288588 +- 0.0125589      6      bad       <--
chromium@521587      0.288123 +- 0.0146754      6      bad
chromium@521589      0.286828 +- 0.0129967      6      bad
chromium@521597      0.280532 +- 0.0134807      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...www.nyc.gov thread_times.simple_mobile_sites

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8958465985384682192


For feedback, file a bug with component Speed>Bisection