All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=617113

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgnPr0rQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgnOn7qQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg3OCJvgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg3Ly4twoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgnNPasgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg3NzvpgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg3Lr9qwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgnKf3qQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg3KCvugoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg3NzaogoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgnLq4vwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgnJPppQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg3MDH5QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgnNWqoQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg3NrhqQoM


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

android-galaxy-s5
android-nexus5
android-nexus5X
android-nexus6
chromium-rel-mac-retina
chromium-rel-mac10
chromium-rel-mac11
linux-release

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

Hi hayato@chromium.org, the bisect results pointed to your CL below as possibly
causing a regression. Please have a look at this info and see whether
your CL be related.


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


===== SUSPECTED CL(s) =====
Subject : Remove Event.relatedTargetScoped and update event path calculation for relatedTarget
Author  : hayato
Commit description:
  
See the context: https://github.com/w3c/webcomponents/issues/486

The spec change:
- https://github.com/w3c/webcomponents/commit/f113e26bfa999bac730c65ea7418fe787500313c
- https://github.com/w3c/webcomponents/commit/b1433e5f3a013ca825f02fb8f7b0e9d6217c0125

BUG= 531990 

Review-Url: https://codereview.chromium.org/2030513002
Cr-Commit-Position: refs/heads/master@{#397329}
Commit  : a4b8210a70c2b5315fbff25cadde8b756137d557
Date    : Thu Jun 02 07:33:47 2016


===== TESTED REVISIONS =====
Revision         Mean     Std Dev  N  Good?
chromium@397328  26512.2  399.735  5  good
chromium@397329  19203.6  239.236  5  bad    <--
chromium@397330  19090.9  161.759  5  bad
chromium@397332  19229.2  104.472  5  bad

Bisect job ran on: mac_retina_perf_bisect
Bug ID: 617113

Test Command: src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --also-run-disabled-tests blink_perf.events
Test Metric: EventsDispatchingInShadowTrees/EventsDispatchingInShadowTrees
Relative Change: 27.47%
Score: 99.9

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/mac_retina_perf_bisect/builds/1318
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9010881671562665856


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5341494790062080

| 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!

I have an idea to make it faster, but, basically, this should be considered 'WONTFIX'.

*The root cause* is that we forgot to update these benchmarks when Event.relatedTargetScoped was introduced. Thus, the score got improved *unintentionally* at that time.

Now, the new spec requires that we have to retarget relatedTargets *always*. Thus, these micro benchmark's score becomes to the former level.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6bd0c6392adc136ea7ac74a67fc0c676318a1b50

commit 6bd0c6392adc136ea7ac74a67fc0c676318a1b50
Author: hayato <hayato@chromium.org>
Date: Mon Jun 06 06:12:44 2016

Cache the result of isScopedInV0 flag in Event object

This makes the micro benchmarks (PerformanceTests/Events/) slightly faster.

BUG= 531990 , 617113 

Review-Url: https://codereview.chromium.org/2034413002
Cr-Commit-Position: refs/heads/master@{#397983}

[modify] https://crrev.com/6bd0c6392adc136ea7ac74a67fc0c676318a1b50/third_party/WebKit/Source/core/events/Event.cpp
[modify] https://crrev.com/6bd0c6392adc136ea7ac74a67fc0c676318a1b50/third_party/WebKit/Source/core/events/Event.h