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Metrics have to be persisted to disk and one possibility
is to simply use file-backed memory which leaves the
responsibility to the OS. It is simple and reliable but
there are concerns about what impact this could have on
performance.

Enabling this as an experiment will allow direct
collection of real data as to how Chrome is affected
by it and thus make possible an informed decision about
whether to use it or not.

BUG=546019

Review-Url: https://codereview.chromium.org/2010173005
Cr-Commit-Position: refs/heads/master@{#403368}