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We've seen some anecdotal evidence in local testing that mojo::DataPipe
creation can sometimes take milliseconds to complete.  Currently there
is a pipe created on the ServiceWorker thread for certain FetchEvent
respondWith() code paths.  This histogram will help us determine if
this is introducing jank on the service worker thread.

Bug: 888045
Change-Id: I5f36da2dfbde4bd561c605336949e475f45ecb43
Reviewed-on: https://chromium-review.googlesource.com/1239274Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593302}