All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=775307

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=2013d1d3249156de5ad2ab2f9e8bc67628fe398b2dd1ce9badb2102daa2138c3


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

chromium-rel-mac-retina

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8965532468093126800

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

Hi ishell@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 : Igor Sheludko
  Commit : 36860509fbc5c63f5351aa45e66418a79fa26758
  Date   : Fri Oct 13 09:09:28 2017
  Subject: Reland "[runtime] Make JSFunction::prototype_or_initial_map field optional."

Bisect Details
  Configuration: mac_retina_perf_bisect
  Benchmark    : media.desktop
  Metric       : memory:chrome:all_processes:reported_by_chrome:v8:effective_size_avg/video.html?src_tulip2.wav_type_audio
  Change       : 1.94% | 3258170.85714 -> 3321492.92308

Revision                           Result                  N
chromium@508851                    3258171 +- 460397       14      good
chromium@508870                    3229981 +- 439406       9       good
chromium@508870,v8@126b2bd281      3221203 +- 430517       6       good
chromium@508870,v8@e770879eee      3330883 +- 1092.15      14      good
chromium@508870,v8@bde0733a8d      3205217 +- 632539       14      good
chromium@508870,v8@3de3a6b0f7      3331344 +- 538.799      6       good
chromium@508870,v8@36860509fb      3427503 +- 418.671      6       bad       <--
chromium@508870,v8@bb514c426b      3427471 +- 285.638      6       bad
chromium@508870,v8@80607c4001      3318043 +- 895564       21      bad
chromium@508871                    3394044 +- 441804       14      bad
chromium@508872                    3376196 +- 432721       9       bad
chromium@508873                    3376402 +- 432285       9       bad
chromium@508875                    3376151 +- 432528       9       bad
chromium@508879                    3376476 +- 431515       9       bad
chromium@508888                    3329340 +- 702240       14      bad
chromium@508925                    3321493 +- 696692       13      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.tulip2.wav.type.audio media.desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8965532468093126800


For feedback, file a bug with component Speed>Bisection