WebGL not being blocked in workers

[pilgrim-brave]

Noted in #11368 (comment)

[btlechowski]

@pilgrim-brave Could you include test plan for this issue?

[pes10k]

Hi @btlechowski, the test plan is to just make sure that all the values on the "WebGL Drawing" row on https://dev-pages.bravesoftware.com/farbling.html and https://dev-pages.brave.software/farbling.html match.

I believe @pilgrim-brave is working out some edge cases still but once he gives the 👍 , thats the test plan. Hope that helps!

[LaurenWags]

@pes10k looks like this isn't working as per #11839 (comment) (note, sites were viewed with default shields/FP=Standard)

Do you want to check the sites to confirm they're set up correctly before I log a follow up issue?

Brave	1.16.52 Chromium: 86.0.4240.68 (Official Build) dev (x86_64)
Revision	ad72ee9aa8e15ed300df1238e76c7a8f4d686f97-refs/branch-heads/4240@{#1097}
OS	macOS Version 10.14.6 (Build 18G3020)

labeling as QA/Blocked until the above is sorted

[pes10k]

Thanks @LaurenWags, the current tests are correct, so I think @pilgrim-brave will be needed to figure out the way forward here

[LaurenWags]

holding on logging a follow up until @pes10k is able to review #11368 (comment)

[LaurenWags]

Still seeing some issues with this - logged follow up issue #12098

Going to mark this one as QA/No and release-notes/exclude since testing will be done with the above issue. Please let me know if there are any objections @rebron @pes10k .