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servo/components/script
bors-servo 36ddf763f6 Auto merge of #14351 - asajeffrey:servo-rand-share-fds, r=emilio
An in-memory RNG that shares its file descriptor.

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This PR implements an in-memory random number generator that only uses an OS RNG for (re)seeding. The OS RNG is shared, so there's only one file descriptor for `/dev/urandom` being used.

The PR also implements a tidy check that we don't accidentally introduce an RNG. Rather annoyingly, there are a lot of transitive dependencies on `rand`, notably hash maps in `std`.

This PR makes it possible to use uuids for identifiers such as pipeline and frame ids.

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes do not require tests because it's fixing a resource issue

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