battor.steady_state failing on chromium.perf/Mac Retina Perf

Builders failed on: 
- Mac Retina Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Mac%20Retina%20Perf


It seems to time out after an hour. I think the test completes just fine, and then hangs? The screenshot is very strange too.

Example task: https://chromium-swarm.appspot.com/task?id=36e9829cd8764a10&refresh=10&show_raw=1

I tried looking at other mac bots, because according to the code, it looks like it should be running on all mac bots (https://cs.chromium.org/chromium/src/tools/perf/benchmarks/battor.py?q=battor.py+package:%5Echromium$&l=55). However, it seems to be disabled on other platforms?? https://chromium-swarm.appspot.com/task?id=36e98838f9e60010&refresh=10&show_raw=1 is an example.