All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=783693

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=61013827b8564a5a9c0985b5ba69241d8af1c56448ec29a90c8bdbff3b21f898


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

android-webview-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8963319541106108432

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

Suspected Commit
  Author : Ulan Degenbaev
  Commit : 6bb1d47e6e82f75ead36cdab209afc5dafa8329c
  Date   : Tue Nov 07 13:11:10 2017
  Subject: [heap] Re-enable concurrent marking.

Bisect Details
  Configuration: android_webview_nexus6_aosp_perf_bisect
  Benchmark    : blink_perf.canvas
  Metric       : getImageData/getImageData
  Change       : 9.13% | 89.765100758 -> 81.5653372416

Revision                           Result                   N
chromium@514608                    89.7651 +- 1.07085       6      good
chromium@514631                    90.3359 +- 1.73411       6      good
chromium@514637                    88.329 +- 1.44436        6      good
chromium@514640                    88.4147 +- 1.48316       6      good
chromium@514641                    88.5099 +- 1.43265       6      good
chromium@514641,v8@67d543ec31      88.1695 +- 1.42477       6      good
chromium@514641,v8@6bb1d47e6e      80.5535 +- 1.83084       6      bad       <--
chromium@514641,v8@ac0661b358      80.2064 +- 1.53456       6      bad
chromium@514641,v8@80cb266c75      80.4819 +- 1.38452       6      bad
chromium@514642                    80.0777 +- 0.743086      6      bad
chromium@514653                    81.9577 +- 0.832107      6      bad
chromium@514697                    81.5653 +- 1.37913       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-webview --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests blink_perf.canvas

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8963319541106108432


For feedback, file a bug with component Speed>Bisection