In bug 1673071 I made it so that most of the macOS CI jobs (including test-verify) run with WebRender enabled. However it seems that the verify jobs are not doing this correctly. The mozinfo in the log still says 'webrender': False, even though the job config has 'enable_webrender': True

1. If I run ./mach mochitest --enable-webrender --verify locally it seems to do the right thing
2. The mozinfo that I was looking at here is perhaps not the right one to care about. This is way too early in the log and probably a red herring. But I still do think that on try the job is somehow not getting webrender enabled, because the test in question is failing when it should be passing, and output that normally shows up when WR is enabled doesn't seem to be there.
3. Eyeballing the relevant code and invocation I don't see why webrender would not get enabled. I'll need to do additional try pushes with logging to find out, I think.

I was wrong, this seems to be working fine. For some reason the output that I was expecting to see just doesn't show up on some runs, and the test was failing due to a bug in the test that only manifested on macOS.