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This allows the browser process to set a factory so that the audio
service can create audio logs on the browser process.

Bug: 812557
Change-Id: Ia88acb6cb911fc0ad4a47f20b3a628c814233c6b
Reviewed-on: https://chromium-review.googlesource.com/1128974Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Max Morin <maxmorin@chromium.org>
Reviewed-by: Marina Ciocea <marinaciocea@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575561}