1942306 - Add CSP support for "Create a Trusted Type Policy" for Workers

Status: NEW

(Core :: DOM: Security, task)

Description

[Frédéric Wang (:fredw)]

Follow-up of bug 1901492.

See

https://searchfox.org/mozilla-central/rev/86c208f86f35d53dc824f18f8e540fe5b0663870/dom/security/trusted-types/TrustedTypePolicyFactory.cpp#61-70
https://w3c.github.io/trusted-types/dist/spec/#should-block-create-policy
https://github.com/w3c/trusted-types/issues/574

The rough idea will be to somehow expose trusted-types directives via CSPInfo, so they can be accessed from the worker thread.

In bug 1901492, this was done for require-trusted-types-for but the data was much simpler (essentially a three states enum).