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There were 3 tests disabled in Feb due to flakiness (RunLoop timeout).
This patch re-enables one of them to verify whether the flakiness has
been fixed by recent changes and gather up-to-date failure logs if not.

Bug: 1052385
Change-Id: Ib9dcabf769a4ff03d31e1ec1601c69717f590040
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302409Reviewed-by: Sam Goto <goto@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789789}