All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=792078

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=66e78959673c92cc614682bcc63173add925b377cdd575c8f010c98e547c4695


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

android-nexus5
android-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8961032585839865456

=== BISECT JOB RESULTS ===
Perf regression found with culprit

Suspected Commit
  Author : Naina Raisinghani
  Commit : b71f5b7df345f1a8603b7cf7b59edf48288e7d96
  Date   : Mon Dec 04 01:01:29 2017
  Subject: Remove calls to styleForLayoutObject() in LayoutTreeBuilder::style()

Bisect Details
  Configuration: android_nexus6_perf_bisect
  Benchmark    : blink_perf.shadow_dom
  Metric       : v1-large-deep-layout/v1-large-deep-layout
  Change       : 36.14% | 19749.6693333 -> 26886.357

Revision             Result                  N
chromium@521233      19749.7 +- 73.5383      6      good
chromium@521238      20023.5 +- 167.814      6      good
chromium@521239      20019.8 +- 216.665      6      good
chromium@521240      26501.6 +- 128.489      6      bad       <--
chromium@521241      26434.9 +- 154.428      6      bad
chromium@521243      26525.0 +- 61.9566      6      bad
chromium@521253      26886.4 +- 113.667      6      bad

Please refer to the following doc on diagnosing blink_perf regressions:
  https://chromium.googlesource.com/chromium/src/+/master/docs/speed/benchmark_harnesses/blink_perf.md

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 blink_perf.shadow_dom

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8961032585839865456


For feedback, file a bug with component Speed>Bisection