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This change checks the interfaces on a detected USB printer to see if any of
them support ipp-over-usb. A new flag has been added to the Printer class to
indicate whether or not it does.

Once the printer has been detected, in the event that we don't have a PPD for it
and it supports ipp-over-usb then we set it up as an ipp everywhere printer.

R=justincarlson@chromium.org, skau@chromium.org

Bug: 768606
Change-Id: I38214e0ce4f8ecee262ae94ac548cd79626f8a82
Reviewed-on: https://chromium-review.googlesource.com/842691
Commit-Queue: David Valleau <valleau@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551064}