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This CL adds a few debug lines to investigate flakiness. There's no
behavioral change and the commit will get reverted once the
investigation is over.

Bug: 997629
Change-Id: I55a19c467affdaed1ed62ea8fb2545dc570b2877
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026734
Commit-Queue: Maxim Kolosovskiy <kolos@chromium.org>
Reviewed-by: Maxim Kolosovskiy <kolos@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737264}