All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=727751

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgxrDm8wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDghoqJqAkM


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

chromium-rel-mac11
chromium-rel-win10

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8978151077595121488

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

Hi sammc@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 : Sam McNally
  Commit : 33eaae62b5c0005b2959393bb473445a7d77bb4f
  Date   : Mon May 29 06:39:41 2017
  Subject: Enable PrefService by default.

Bisect Details
  Configuration: winx64_10_perf_bisect
  Benchmark    : media.tough_video_cases_tbmv2
  Metric       : memory:chrome:all_processes:reported_by_chrome:malloc:effective_size_avg/video.html?src_tulip2.mp3_type_audio
  Change       : 2.52% | 13089570.0 -> 13419789.0

Revision             Result                   N
chromium@475280      13089570 +- 108534       6      good
chromium@475297      13135200 +- 131210       6      good
chromium@475299      13125094 +- 114242       6      good
chromium@475300      13395867 +- 98018.7      6      bad       <--
chromium@475301      13406338 +- 117500       6      bad
chromium@475305      13368276 +- 87433.7      6      bad
chromium@475313      13419789 +- 140104       6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=video.html.src.tulip2.mp3.type.audio media.tough_video_cases_tbmv2

Debug Info
  https://chromeperf.appspot.com/buildbucket_job_status/8978151077595121488

Is this bisect wrong?
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5870021072388096


| O O | Visit http://www.chromium.org/developers/speed-infra/perf-bug-faq
|  X  | for more information addressing perf regression bugs. For feedback,
| / \ | file a bug with component Speed>Bisection.  Thank you!