This is a regression issue, broken in M-67 and below is the narrow bisect info:
Good Build : 67.0.3390.0 (revision : 548637)
Bad Build : 67.0.3393.0 (revision : 549377)

(Getting 'No enough builds..' error while performing bisect with per-revision script hence providing the bisect using old script)

Narrow bisect URL : 
https://chromium.googlesource.com/chromium/src/+log/2967489d082e4175e49956f5dd5b6d50468c5f73..972d135e00d4462bcd1443ea2b17ab6ef20d746a?pretty=fuller&n=10000

Suspecting : r548979

@Alexei : Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Note : 
1. Issue is also observed in Dev build #67.0.3393.4
2. Able to reproduce issue on Mac(10.12.6, 10.13.1, 10.13.5) OS but the same issue is not observed on Linux(14.04 LTS) machine

Adding release blocker label for this issue.Please reduce priority or remove if not the case.

Thank You!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0eab72ec3aa68755dfb7fa1a9282a4dd0d5f945a

commit 0eab72ec3aa68755dfb7fa1a9282a4dd0d5f945a
Author: Alexei Filippov <alph@chromium.org>
Date: Wed Apr 18 03:25:32 2018

DevTools: Do not start performance monitor until model is ready.

BUG= 833271 

Change-Id: I62b0f0a598fa9caabde156609a8176ebad965e88
Reviewed-on: https://chromium-review.googlesource.com/1015536
Commit-Queue: Alexei Filippov <alph@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551568}
[modify] https://crrev.com/0eab72ec3aa68755dfb7fa1a9282a4dd0d5f945a/third_party/blink/renderer/devtools/front_end/performance_monitor/PerformanceMonitor.js

Update : 
Retested above issue in latest Canary build #68.0.3400.0 on Windows(7,8,8.1,10) and Mac(10.12.6, 10.13.1, 10.13.5) OS and the issue is fixed. 'Performance monitor' tab is working as expected in latest build #68.0.3400.0. Kindly review an attached screen-cast.

Thank you..!

Deleted: Canary_build_behaviour.mp4 642 KB

	Canary_build_behaviour.mp4 642 KB View Download

M67 Stable promotion is coming soon. Your bug is labelled as Stable ReleaseBlock, pls make sure to land the fix and request a merge into the release branch ASAP. Thank you.

This bug requires manual review: M67 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), kbleicher@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Approving merge to M67 branch 3396 based on comment #4. Please merge ASAP. Thank you.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6f47221b088d44155311bc7cc8c64861bd1c0066

commit 6f47221b088d44155311bc7cc8c64861bd1c0066
Author: Alexei Filippov <alph@chromium.org>
Date: Wed May 02 01:11:02 2018

DevTools: Do not start performance monitor until model is ready.

BUG= 833271 
TBR=alph@chromium.org

(cherry picked from commit 0eab72ec3aa68755dfb7fa1a9282a4dd0d5f945a)

Change-Id: I62b0f0a598fa9caabde156609a8176ebad965e88
Reviewed-on: https://chromium-review.googlesource.com/1015536
Commit-Queue: Alexei Filippov <alph@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#551568}
Reviewed-on: https://chromium-review.googlesource.com/1038790
Reviewed-by: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/branch-heads/3396@{#433}
Cr-Branched-From: 9ef2aa869bc7bc0c089e255d698cca6e47d6b038-refs/heads/master@{#550428}
[modify] https://crrev.com/6f47221b088d44155311bc7cc8c64861bd1c0066/third_party/blink/renderer/devtools/front_end/performance_monitor/PerformanceMonitor.js

Update : 
Retested above issue in Beta build #67.0.3396.40 on Windows(7,8,8.1,10) and Mac(10.12.6,10.13.1,10.13.5) OS and the issue is fixed. 'Performance monitor' tab  work as expected after reopening devtools window. Kindly review an attached screen-cast.

Thank you..!

Deleted: 67.0.3396.40 _Behaviour.mov 5.2 MB

	67.0.3396.40 _Behaviour.mov 5.2 MB View Download