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These tests experience setup slowness on Mac leading to flakiness, so
let's add a few traces to confirm this hypothesis and narrow down the
source of the slowness.

Bug: 1131588
Change-Id: Idc077fab344c17d64a98cdc4146dd049d37b02f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2431026Reviewed-by: Victor Vianna <victorvianna@google.com>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810573}