All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=745903

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=b6e6a5a56844784ef1050a0ae01c5f332f0cbc9f6418726e8ee9e9bcaceef757


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

chromium-rel-win8-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8973706439408098112

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

Suspected Commit
  Author : Hajime Hoshi
  Commit : 5d64433a4a096a86544cd6d80f0a18ef066396ce
  Date   : Thu Jul 13 14:50:22 2017
  Subject: Add SharedMemory::mapped_id()

Bisect Details
  Configuration: win_8_perf_bisect
  Benchmark    : media.tough_video_cases_tbmv2
  Metric       : memory:chrome:browser_process:reported_by_chrome:effective_size_avg/memory:chrome:browser_process:reported_by_chrome:effective_size_avg
  Change       : 34.90% | 31309708.5567 -> 42238204.0556

Revision             Result                   N
chromium@486351      31309709 +- 79365.5      6      good
chromium@486373      31300031 +- 51360.6      6      good
chromium@486374      31316175 +- 30630.5      6      good
chromium@486375      42258903 +- 28373.2      6      bad       <--
chromium@486376      42207069 +- 267026       6      bad
chromium@486379      42257603 +- 44693.5      6      bad
chromium@486384      42269672 +- 24508.6      6      bad
chromium@486394      42140428 +- 340876       6      bad
chromium@486437      42238204 +- 60944.7      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 media.tough_video_cases_tbmv2

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8973706439408098112


For feedback, file a bug with component Speed>Bisection