All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=744737

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=b1126b0000cd4d2d3ed65d78a49c7e1b54aea7b75804759b196acaa21b9aad87


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

chromium-rel-win8-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8973798638239999456

=== 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/video.html?src_garden2_10s.webm
  Change       : 63.82% | 56214882.0381 -> 92089708.6667

Revision             Result                   N
chromium@486351      56214882 +- 21660.3      6      good
chromium@486373      56223943 +- 16421.5      6      good
chromium@486374      56210625 +- 12713.3      6      good
chromium@486375      92091241 +- 9043.13      6      bad       <--
chromium@486376      92088027 +- 18375.1      6      bad
chromium@486379      92088849 +- 21040.0      6      bad
chromium@486384      92089103 +- 21455.2      6      bad
chromium@486394      92103298 +- 33305.3      6      bad
chromium@486437      92089709 +- 24310.3      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=video.html.src.garden2.10s.webm 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/8973798638239999456


For feedback, file a bug with component Speed>Bisection