GitLab

USB printers are installed automatically if we are sure of the
configuration.  Log these printers with USB attributes and the fact
that they were configured automatically.

Bug: 740270, 725739
Change-Id: I50d4596cbf94fc9de8871cf5c8e02ded75e05681
Reviewed-on: https://chromium-review.googlesource.com/598691Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Sean Kau <skau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491800}