Cannot reproduce.

Can you please help us debug the issue. Open DevTools on DevTools (by pressing Ctrl+Shift+I in undocked DevTools) and check if there are any error messages in the console.

Also can you please save the profile and attach it to the bug report.

Thank you

Absolutely, 

Attached is the screen shot of the dev tools on dev tools. Looks ok?

I also attached the profile. This has 100% reproduction rate for me (tried on a few different webGL based sites)

Not sure if it makes a difference, I have these two plugins installed (though not active):
https://spector.babylonjs.com/
https://benvanik.github.io/WebGL-Inspector/

I heard about this issue from a member of the pixi.js community, I will see if I can get any additional information for you from there.

Thanks for looking into this! If you need anything let me know.

Deleted: Profile-20180929T083933 11.2 MB

Profile-20180929T083933 11.2 MB View Download

Deleted: Screenshot 2018-09-29 08.42.55.png 66.4 KB

	Screenshot 2018-09-29 08.42.55.png 66.4 KB View Download

Same here, although doesn't seem to be consistent. More times than not it doesn't display the flame chart.

Chrome 69.0.3497.100, macOS 10.13.6

Seems to work as expected on Canary

Deleted: Screen Shot 2018-09-29 at 15.35.27.png 3.0 MB

	Screen Shot 2018-09-29 at 15.35.27.png 3.0 MB View Download

No errors on DevTools for DevTools. The canvas for the performance timeline is there and correctly sized, but doesn't show. I've also tried running without extensions.

I noticed the same thing occurring across multiple computers. 

Deleted: Screen Shot 2018-09-29 at 1.21.26 PM.png 463 KB

	Screen Shot 2018-09-29 at 1.21.26 PM.png 463 KB View Download

Needs-Feedback:

on my side
chromium: "69.0.3497.81" work
chrome: "69.0.3497.100 (Build officiel) (64 bits)" not worked

so maybe it between update .81 and .100

Here's the list of commits into Chrome between versions:
https://chromium.googlesource.com/chromium/src/+log/69.0.3497.81..69.0.3497.100?pretty=fuller&n=10000

V8: https://chromium.googlesource.com/v8/v8/+log/6.9.427.19..6.9.427.23?pretty=fuller&n=10000

No changes to skia.

ok i just test last chromium version from nwjs.
Chromium: 70.0.3538.22
and it work.

I don't know if you have very big difference with chromium and chrome for the debug tool.
i can not test chromium "69.0.3497.100" ! sorry

my test for can not be conclusive because i'm not loading my project debugging webGL applications.
it just a fast test sorry. 
If i update my project to Chromium: 70.0.3538.22, i will share, maybe next month.

No new failure reports since M70. Mark as non-repro.