Running tests?

Hey guys, I'm looking at getting these tests running in open source, as I have a few changes I'd like to propose, and thought it might make sense to submit tests to help make my case. I nearly have the tests compiling, but one class is eluding me: `com.google.common.annotations.UsedReflectively`. I haven't found any trace of it on the internet - except for https://github.com/google/guava/issues/1617, which says (as of 2013) that it could get put somewhere more general for others to see it.

In context (and from the linked issue above), it might just be the equivalent of `@SuppressWarnings("unused")`, but considering how it is used, it could also have specific meaning to something like GWT->Closure or J2CL->Closure, in that the method name shouldn't be obfuscated. `@JsMethod` (with exports turned on during tests) would be enough to ensure that for GWT2 at least, but this annotation might have other work to do in cases involving closure.

Removing all trace of this annotation seems to at least get tests to compile (though I'm still missing a few stray dependencies). Is this something that can be made more general, so I could propose a patch to get tests running?