All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=629206

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgitz25QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgiqDi2AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg8smw-wkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgipSpmwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgiqPmowkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgiq_w-AkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgitrk-gsM


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

chromium-rel-win10
chromium-rel-win7-gpu-ati
chromium-rel-win7-gpu-intel
chromium-rel-win7-gpu-nvidia

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/9006765795033417728

===== BISECT JOB RESULTS =====
Status: completed


=== Bisection aborted ===
The bisect was aborted because The metric values for the initial "good" and "bad" revisions do not represent a clear regression.
Please contact the the team (see below) if you believe this is in error.

=== Warnings ===
The following warnings were raised by the bisect job:

 * Bisect failed to reproduce the regression with enough confidence.

===== TESTED REVISIONS =====
Revision         Mean     Std Dev   N   Good?
chromium@405134  211.931  0.739935  18  good
chromium@405135  212.454  0.916258  18  bad

Bisect job ran on: winx64intel_perf_bisect
Bug ID: 629206

Test Command: src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --also-run-disabled-tests blink_perf.shadow_dom
Test Metric: ChangingSelectWithoutShadow/ChangingSelectWithoutShadow
Relative Change: 0.24%
Score: 0

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/winx64intel_perf_bisect/builds/1028
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9006765795033417728


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5819614202691584

| 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 Tests>AutoBisect.  Thank you!

My CL can't affect these tests.

Assigning to current perf sheriff for further triage...

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/9005516800970318752

Trying another bisect.

===== BISECT JOB RESULTS =====
Status: completed


===== SUSPECTED CL(s) =====
Subject : Disable Full-WPO for the x64 official build (non-PGO).
Author  : sebmarchand
Commit description:
  
Disable Full-WPO for the x64 official builds (this doesn't
affect the PGO builds).

This should help me to get an official
"non-PGO & non-WPO" build that I can compare against an official PGO
build.

Also I'm not sure if it's worth keeping WPO turned on for the official
builds at the moment ? We don't ship these builds (we ship the PGO ones)
and so this only slowdown the builders that build an official x64 build
for testing purposes (especially considering that they need to link all the unittests with Full-WPO)

BUG= 490934 , 617982

Review-Url: https://codereview.chromium.org/2142603002
Cr-Commit-Position: refs/heads/master@{#405164}
Commit  : 0d74d7f71c93bfc3b32653de7958ff84d173937d
Date    : Wed Jul 13 15:42:28 2016


===== TESTED REVISIONS =====
Revision         Mean     Std Dev   N  Good?
chromium@405000  225.837  0.640608  5  good
chromium@405150  222.302  2.17799   5  good
chromium@405161  222.256  0.419191  5  good
chromium@405163  222.291  0.524084  5  good
chromium@405164  260.442  0.704322  5  bad    <--
chromium@405166  268.702  0.986756  5  bad
chromium@405171  278.531  1.34957   5  bad
chromium@405190  262.927  0.9004    5  bad
chromium@405223  265.319  2.69953   5  bad
chromium@405300  248.996  0.365796  5  bad

Bisect job ran on: winx64_10_perf_bisect
Bug ID: 629206

Test Command: src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --also-run-disabled-tests blink_perf.shadow_dom
Test Metric: ChangingSelectWithoutShadow/ChangingSelectWithoutShadow
Relative Change: 10.26%
Score: 99.9

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/winx64_10_perf_bisect/builds/629
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9005516800970318752


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5803762543755264

| 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 Tests>AutoBisect.  Thank you!