All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=777314

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=6def408abe5071245d063288c0b4e772f02b0a934e5b344aa59f028f5ea15472


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

chromium-rel-mac11

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8964955957216602832

=== Auto-CCing suspected CL author ajwong@chromium.org ===

Hi ajwong@chromium.org, the bisect results pointed to your CL, please take a look at the
results.


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

Suspected Commit
  Author : Albert J. Wong
  Commit : b43627f02312b1045039c35e68cf5ca17ff4ec86
  Date   : Fri Oct 20 22:53:11 2017
  Subject: Only commit used regions of a SuperPage.

Bisect Details
  Configuration: mac_10_11_perf_bisect
  Benchmark    : v8.runtimestats.browsing_desktop
  Metric       : v8-gc-phantom-handle-callback_max/browse_media/browse_media_imgur
  Change       : 102.75% | 0.364166666667 -> 0.738333333333

Revision             Result                     N
chromium@510489      0.364167 +- 0.0945877      6      good
chromium@510552      0.406167 +- 0.205224       6      good
chromium@510584      0.359833 +- 0.0900713      6      good
chromium@510592      0.4045 +- 0.0962782        6      good
chromium@510594      0.380333 +- 0.0895954      6      good
chromium@510595      0.4155 +- 0.102321         6      good
chromium@510596      0.7045 +- 0.309641         6      bad       <--
chromium@510600      0.675333 +- 0.113971       6      bad
chromium@510615      0.738333 +- 0.258003       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 --story-filter=browse.media.imgur v8.runtimestats.browsing_desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8964955957216602832


For feedback, file a bug with component Speed>Bisection