All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=746246

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=ca33769f97751c33402e8e7171772f871f89ba4ebeee1b4b72be0e3a8062a090


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

chromium-rel-mac11-air

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8973652100996360544

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

Suspected Commit
  Author : Sunny Sachanandani
  Commit : 057d5553e4524a7726b2e7d5ecfef85289379000
  Date   : Fri Jul 14 04:07:29 2017
  Subject: cc: Dump more state in begin main frame hang crash key.

Bisect Details
  Configuration: mac_air_perf_bisect
  Benchmark    : blink_perf.shadow_dom
  Metric       : v1-large-deep-layout/v1-large-deep-layout
  Change       : 7.72% | 2133.51977778 -> 2298.16516667

Revision             Result                  N
chromium@486665      2133.52 +- 99.8907      9      good
chromium@486669      2096.47 +- 66.827       6      good
chromium@486670      2360.49 +- 168.769      6      bad       <--
chromium@486671      2346.95 +- 129.196      6      bad
chromium@486672      2370.09 +- 189.168      6      bad
chromium@486678      2336.08 +- 76.6748      6      bad
chromium@486690      2335.54 +- 168.714      6      bad
chromium@486715      2298.17 +- 222.051      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release --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/8973652100996360544


For feedback, file a bug with component Speed>Bisection