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This test has been disabled in https://crrev.com/c/2303433 due to it
being flaky. However its stack trace matches the one observed recently
in production code (crbug.com/1107103) so we're re-enabling it now and
adding some extra debugging information in order to help us fix the
issue, as it hasn't been possible to reproduce it locally so far.

Bug: 1107103
Change-Id: Ifeee8483c83e72b52a232b71ef2437ecab6bf305
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316101Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Hajime Hoshi <hajimehoshi@chromium.org>
Auto-Submit: Mario Sanchez Prada <mario@igalia.com>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791714}