All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=749356

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=c4de86a801f22a6649fb169d59fc5307d2b6629cd76b724a7bb715d10d1ea9b2


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

chromium-rel-mac12

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8972959435964859248

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

Suspected Commit
  Author : Matthew Halpern
  Commit : cd7e31fb911a98c7dc021d543e9dea8c553cdb1f
  Date   : Wed Jul 19 20:50:43 2017
  Subject: Enable GRC

Bisect Details
  Configuration: mac_10_12_perf_bisect
  Benchmark    : system_health.memory_desktop
  Metric       : memory:chrome:all_processes:reported_by_chrome:malloc:effective_size_avg/load_media/load_media_9gag
  Change       : 1.57% | 46254436.1111 -> 46978757.4444

Revision             Result                   N
chromium@487951      46254436 +- 955991       9      good
chromium@487961      46455010 +- 659801       6      good
chromium@487966      46206515 +- 768136       6      good
chromium@487967      46273964 +- 955455       9      good
chromium@487968      46951210 +- 1094177      9      bad       <--
chromium@487969      46947359 +- 941453       9      bad
chromium@487971      47097442 +- 347279       6      bad
chromium@487990      46963326 +- 776671       6      bad
chromium@488029      47081209 +- 723229       6      bad
chromium@488106      46978757 +- 1197775      9      bad

Please refer to the following doc on diagnosing memory regressions:
  https://chromium.googlesource.com/chromium/src/+/master/docs/memory-infra/memory_benchmarks.md

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=load.media.9gag system_health.memory_desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8972959435964859248


For feedback, file a bug with component Speed>Bisection