All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=839567

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=a12cb2e92360cdf402fcc742d2fb5ca5cd7eeb56345170f32102bfa5432cdac2


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

android-nexus5

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/1491ada3c40000

😿 Pinpoint job stopped with an error.
https://pinpoint-dot-chromeperf.appspot.com/job/1491ada3c40000

'ReadHistogramsJsonValue' object has no attribute '_results_filename'

Can someone trigger a new Pinpoint run? This regression looks pretty big, and I couldn't think of any specific changes in the reported range that could've caused it.

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/129e9607c40000

📍 Found significant differences after each of 9 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/129e9607c40000

Add ARCoreDevice rendering path by lincolnfrog@chromium.org
https://chromium.googlesource.com/chromium/src/+/5419fb537bcc85f88b99f71d244518a96c483498

Bypass tail time computation if IIR filter is unstable by rtoy@chromium.org
https://chromium.googlesource.com/chromium/src/+/949538bb77dce13f23abe328338f50f39c6350e0

Allow URLLoaderInterceptor to support intercepting frame requests when network service is disabled. by jam@chromium.org
https://chromium.googlesource.com/chromium/src/+/db3a13b32f24a916ff5dc1effd6180bfe2df8df7

Eliminate unnecessary lifecycle work on a document being swapped out by szager@chromium.org
https://chromium.googlesource.com/chromium/src/+/b6351b8605d9560a2df9ed18fcd1467c34fe56ed

[V8 Platform] Introduce CallDelayedOnWorkerThread() by gab@chromium.org
https://chromium.googlesource.com/v8/v8/+/4b13a22ff477d56ead2ee452ac4bba52d8f05e92

[V8 Platform] Better WorkerThreads APIs. by gab@chromium.org
https://chromium.googlesource.com/v8/v8/+/4ac96190f74f94f6950c3c8c817ae444efc22b6b

Update V8 to version 6.8.117. by v8-autoroll@chromium.org
https://chromium.googlesource.com/chromium/src/+/f26adef3a8228aab2f69d7a941138508d80d139e

[DevTools] improve safety of Runtime.terminateExecution by kozyatinskiy@chromium.org
https://chromium.googlesource.com/chromium/src/+/8d0f1f7aa1dd3f8cc4eb3bfe2c6a2deeb30fa2b1

[media] Use pixel aspect ratio to compute |natural_size| in all decoders. by sandersd@chromium.org
https://chromium.googlesource.com/chromium/src/+/af451f2b8adfb22eabf60b7232a3c050941c9261

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

Doesn't look like media. Perhaps V8?

Most likely it is mine "[DevTools] improve safety of Runtime.terminateExecution"

The following revision refers to this bug:
  https://chromium.googlesource.com/v8/v8.git/+/aab49f372f48354a32248de858a8347275517062

commit aab49f372f48354a32248de858a8347275517062
Author: Alexey Kozyatinskiy <kozyatinskiy@chromium.org>
Date: Wed May 09 22:31:39 2018

[inspector] do not allocate scope inside CallStackDepth

Allocation is super slow and produce big performance regression on
blink side.

Bug:  chromium:839567 ,chromium:839809
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I3e9989435515ecfaedaee60c1f0c6939b9053e95
Reviewed-on: https://chromium-review.googlesource.com/1053105
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53115}
[modify] https://crrev.com/aab49f372f48354a32248de858a8347275517062/src/api.cc
[modify] https://crrev.com/aab49f372f48354a32248de858a8347275517062/src/execution.cc
[modify] https://crrev.com/aab49f372f48354a32248de858a8347275517062/src/isolate.h

It becomes better with my CL and since other metrics are not affected by my CL and it is required for Runtime.terminateExecution method that is widely used now, I mark it as fixed.