Public bug reported:

Trying to screen share
https://webrtc.github.io/samples/src/content/getusermedia/getdisplaymedia/
gives black screen for "Window" and "Entire screen" share, only mouse
pointer is visible.

"Chromium Tab" screen share works fine.

This worked fine on current stable channel: Version 142.0.7444.59
(Official Build) snap (64-bit)

But fails on current candidate channel: Version 142.0.7444.162 (and also
on previous candidate channel version 142.0.7444.134)


I was in communication with Chromium team 
https://issues.chromium.org/issues/460146094.

Trying to bisect with `python3 ./bisect-builds.py -a linux64 -g
GOOD_VERSION -b BAD_VERSION` fails because for even much older version
gives black screen. I guess being out of snap also prevents screen
share.


```
$ uname -a; type -a chromium
Linux croraf-OMEN-by-HP-Laptop-17-cb0xxx 6.14.0-35-generic #35~24.04.1-Ubuntu 
SMP PREEMPT_DYNAMIC Tue Oct 14 13:55:17 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
chromium is /snap/bin/chromium
chromium is /snap/bin/chromium
```

** Affects: chromium-browser (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "chromium_graphical_log1.txt"
   
https://bugs.launchpad.net/bugs/2131588/+attachment/5926982/+files/chromium_graphical_log1.txt

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https://bugs.launchpad.net/bugs/2131588

Title:
  Chromium screen share black screen - regression

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