All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=731511

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglqi96woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5sXf7AkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5tv9lwgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5r2-owsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgltj0qgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglrT0jQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglvnmpwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5tTbpwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglrS-_QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglpidvQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5sXf7AoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgltKOswsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5oOgqAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglrS-vQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglojOhwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgluLy-ggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgltKOswkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5pv1rAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglqi96wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglvnmpwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglpK_rAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5seJ9AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5rfn4wkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5oWD7wkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglrCK9ggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5pKwigkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgltiquwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5sXf7AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5pb17AkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5rfn4woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglrT0jQgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5pKwigoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5rfn4wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglvD_4goM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5rfnowsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglv7G-AoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgloGXtgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglojOhwgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5qHC_goM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5pa_4goM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5taZlggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5tTbpwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgltj0qgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgltj0qgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5u_g-AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5qXpqgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglsKT8AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglsyb9ggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5q3f8QsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglpSB6wsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5oGE8AkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgloHZugoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5v3xvgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5u_guAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5vvi7AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgltLnpgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5pb1rAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5v3xvgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5pvh5QsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5q3f8QkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglsyNpwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5qLfmQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglqKb4woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5tLdlAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5v2YpwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5sve4AsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglsybtgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5u_FvAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5t-KqAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5sWIoAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5p_8ugkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgloiDjwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5tGUqQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgltLnpgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglsybtgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5qvN4gsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5tGUqQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglsybtgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglsyNpwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgluiBvgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5tHAsAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5oWD7woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5sbeiAgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5rSKoQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglszGqwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5pv1zAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgloHOqwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglrT09QkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5pv1zAgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgloHOqwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglrT09QoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5uWavwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5taZ5goM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5suT6AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5tv95wsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5q-diAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5seJtAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5r2-owkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5sugjggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgloygyAgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg5uG09QsM,ag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Bot(s) for this bug's original alert(s):

chromium-rel-mac-retina
chromium-rel-mac11
chromium-rel-mac11-air
chromium-rel-mac11-pro
chromium-rel-mac12
chromium-rel-win7-gpu-nvidia

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8977297654554731408

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

Suspected Commit
  Author : mek
  Commit : c8e2b27f71c6792fa1072fa98a22c111ad229090
  Date   : Tue Jun 06 23:18:28 2017
  Subject: Switch to mojo localstorage backend by default.

Bisect Details
  Configuration: mac_10_12_perf_bisect
  Benchmark    : loading.desktop
  Metric       : timeToFirstMeaningfulPaint_avg/pcv1-cold/NatGeo
  Change       : 98.44% | 140.558666669 -> 278.920166669

Revision             Result                  N
chromium@477350      140.559 +- 21.4187      6      good
chromium@477424      140.778 +- 13.0024      6      good
chromium@477443      146.892 +- 15.2706      6      good
chromium@477452      142.564 +- 8.93912      6      good
chromium@477457      145.963 +- 12.2071      6      good
chromium@477458      288.993 +- 40.0403      6      bad       <--
chromium@477459      278.819 +- 41.3961      6      bad
chromium@477461      284.179 +- 37.6959      6      bad
chromium@477498      278.92 +- 34.2157       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=NatGeo loading.desktop

Debug Info
  https://chromeperf.appspot.com/buildbucket_job_status/8977297654554731408

Is this bisect wrong?
  https://chromeperf.appspot.com/bad_bisect?try_job_id=4939078119718912


| 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!