All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=738125

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7pDesQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsTAqwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqDL9goM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7uLZtwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoGKoQoM


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

android-nexus6
chromium-rel-mac11-air

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8975426349452561664

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

Suspected Commit
  Author : Marc Treib
  Commit : 6fb10fe065b1cfe4c4aa691c31c03e7387a72d40
  Date   : Mon Jun 26 18:39:55 2017
  Subject: Fieldtrial testing config for CaptureThumbnailOnLoadFinished

Bisect Details
  Configuration: mac_air_perf_bisect
  Benchmark    : blink_perf.svg
  Metric       : FoodLeifLodahl/FoodLeifLodahl
  Change       : 15.48% | 23.1336666667 -> 26.7158333333

Revision             Result                   N
chromium@482319      23.1337 +- 0.912185      6      good
chromium@482330      22.8093 +- 0.48819       6      good
chromium@482335      23.168 +- 1.07977        6      good
chromium@482336      26.9737 +- 1.03045       6      bad       <--
chromium@482337      26.3075 +- 1.72332       6      bad
chromium@482338      27.7508 +- 1.2187        6      bad
chromium@482340      28.066 +- 2.57003        6      bad
chromium@482360      26.2643 +- 1.5542        6      bad
chromium@482400      26.61 +- 1.46322         6      bad
chromium@482480      26.7158 +- 1.47164       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 blink_perf.svg

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8975426349452561664


For feedback, file a bug with component Speed>Bisection

The Macbook regression is probably mine, but the Nexus6 one (mentioned in comment 1) isn't: My change only affects desktop.
Back to tdresser to decide what to do about that.

Nexus 6 was a revert of a recent improvement.

Closing.