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The theory is that the count difference is due to different timing of
events when navigation happens during the output stream creation.
That situation would correspond to the cases when AudioOutputStreamBroker
is destroyed while its internal |disconnect_reason_| state is
DisconnectReason::kDocumentDestroyed.
We'll measure both probability of this situation as well as duration
of stream creation as seen by AudioOutputStreamBroker.

Bug: 867827
Change-Id: I226fd275b485cccbc3899ec4c6fa39232a719979
Reviewed-on: https://chromium-review.googlesource.com/1249841
Commit-Queue: Olga Sharonova <olka@chromium.org>
Reviewed-by: Max Morin <maxmorin@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595776}