Add per test timeout

[Momcilo42]

This allows for a test to timeout when hanging.
It's also more useful than the general timeout option as this shows if more than one test can timeout.

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[Momcilo42]

@pbos Can you take a look?

[pbos]

Hi, sorry I'm out on parental leave until ~November. I'll take a look then.

@jleconte2 do you know off the top of your head how WebRTC deals with test timeouts? I wouldn't want us to duplicate functionality if we already offer something similar.

[jleconte2]

WebRTC runs gtest_parallel under LUCI infrastructure which provides its own timeouts management.
It currently does not use the timeouts provided by gtest_parallel.

[Momcilo42]

@pbos Can you take a look now?

[pbos]

It looks like upstream isn't interested in adding per-test-timeout (since gtest runners like blaze and cmake support timeout) and I think gtest-parallel falls within the scope of being a gtest runner. Thanks!