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V8 likes to ask us to store whopping 12-bytes into stream 2 a lot
(some sort of timestamp + tag); and, well, creating separate files for
that might be something of an overkill; so measure how expensive it is
to open them to see if some sort of packing it with streams 0 and 1 is
worth the code complexity.

Change-Id: Id6ae6d531546fce97388e38d79152c89cb4552aa
Reviewed-on: https://chromium-review.googlesource.com/899442Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Maks Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534125}