All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=792454

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=fbf04dc2ff7785a3ee50f083a93cca41d347bc150b719bacb2e5da4bd3f60b2a


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

android-nexus6
android-nexus7v2
android-webview-nexus5X
android-webview-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8960949363055883360

=== 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_nexus7_perf_bisect
  Benchmark    : thread_times.key_mobile_sites_smooth
  Metric       : thread_raster_cpu_time_per_frame/http___www.boingboing.net
  Change       : 48.40% | 0.935715752394 -> 1.38864507416

Revision             Result                     N
chromium@521495      0.935716 +- 0.0236961      6      good
chromium@521556      0.918563 +- 0.0375065      6      good
chromium@521571      0.917598 +- 0.0122066      6      good
chromium@521579      0.907974 +- 0.0268091      6      good
chromium@521583      0.90361 +- 0.041187        6      good
chromium@521585      0.911561 +- 0.0469534      6      good
chromium@521586      1.39306 +- 0.0518671       6      bad       <--
chromium@521616      1.38865 +- 0.0422657       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.boingboing.net thread_times.key_mobile_sites_smooth

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8960949363055883360


For feedback, file a bug with component Speed>Bisection