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PROBLEM: Each event resolve a pending promise if set, however this is racy,
sometimes it is set after the event.

FIX: Switch to waiting until there is *at least* N events. We need to
track more state in the test but we can cope with events arriving
early.

Bug: 1029238
Change-Id: If4c14b82907d5bb6460208e6218e84501b836ff9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946187Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Fergal Daly <fergal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720764}