Fix TestEventBusGlobally from occasionally timing out
Fix TestEventBusGlobally from occasionally timing out

Debugged with the age old method of printf bisecting.

BUG=skia:5269

Review-Url: https://codereview.chromium.org/1963793002

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot