All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=847990

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=645ea8b0b2d5dfe8c16f29067a1187091dcde820a7425d03aea87a22fd1eccdc


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

chromium-rel-mac12
linux-perf
mac-10_12_laptop_low_end-perf

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/14aa967a240000

📍 Found significant differences after each of 7 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/14aa967a240000

Reland "Adding absl includes and defines to rtc_* templates." by mbonadei@webrtc.org
https://webrtc.googlesource.com/src/+/fae51e4c95780f59f4bedf6e01403ff86152e168
1847 → 1858 (+10.87)

Roll src/third_party/webrtc/ b3085b288..dacec71b1 (5 commits) by webrtc-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
https://chromium.googlesource.com/chromium/src/+/0257046a7d6014205c898f17079f091eccae8f27
1858 → No values

Remove important sites on Desktop by dullweber@chromium.org
https://chromium.googlesource.com/chromium/src/+/eff032d48fd7361504192c53d7a88ed88f11de12
No values → 1848

[TaskScheduler] Slower latency heartbeat by gab@chromium.org
https://chromium.googlesource.com/chromium/src/+/7e7dd55cce56f643d5945f5a2dbd42d475c73e1b
1848 → 1845 (-2.618)

Move NavigationRequest creation to NavigationController: 2/3 by clamy@chromium.org
https://chromium.googlesource.com/chromium/src/+/ea99ea1dc01c5bbf058c18abe50008147e5b7ae9
1844 → 1837 (-7.418)

Add WebUSB settings deletion by dullweber@chromium.org
https://chromium.googlesource.com/chromium/src/+/9ccc4fae6f48397e737e3075224688adf133746b
1840 → 1825 (-15.07)

[Squad] Recalc style for re-attach for assigned nodes. by futhark@chromium.org
https://chromium.googlesource.com/chromium/src/+/329876ebb0709a460e96f540721ec8f8cf68845b
1824 → 4.48e+04 (+4.297e+04)

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4ae86dbc5688caa90fda5e56c0437e8573bea32b

commit 4ae86dbc5688caa90fda5e56c0437e8573bea32b
Author: Rune Lillesveen <futhark@chromium.org>
Date: Thu May 31 10:51:27 2018

[Squad] Fix perf regression in reattach recalc.

Make sure we don't recalc style for reattach more than once per element.

In [1], we introduced recalculating style for reattach of assigned nodes
from the slots, but we missed a check to not traverse into the same
nodes when traversing light tree children.

Added a DCHECK on GetNonAttachedStyle as a sanity check.

[1] http://crrev.com/329876ebb0709a460e96f540721ec8f8cf68845b

TEST=third_party/blink/perf_tests/shadow_dom/v1-small-deep-layout.html

Bug:  847990 
Change-Id: I0596d92089b054dafdc3e25b21b6180ca71ec812
Reviewed-on: https://chromium-review.googlesource.com/1079549
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563188}
[modify] https://crrev.com/4ae86dbc5688caa90fda5e56c0437e8573bea32b/third_party/blink/renderer/core/dom/container_node.cc
[modify] https://crrev.com/4ae86dbc5688caa90fda5e56c0437e8573bea32b/third_party/blink/renderer/core/dom/element.cc