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This gives a general idea of how long the videos saved on file are. I
looked into adding a test (ps1), but with the multi-threading and async
operations I'm afraid it would be flaky, plus it saved some recording
files locally.

Test: manual
Bug: 1140182
Change-Id: Ib471d6eae0a8c49321984d941fb0775f49ca11a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519853Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824616}