Introduce Printer::IsUsbProtocol method

- Adds an IsUsbProtocol method to the Printer class for determining
whether the printer is a USB printer
- Fixes incorrect comment wrapping

Bug: 951136
Change-Id: I7802db79b608931eda466c1434e72ac7c1ca1124
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1567885
Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653052}
3 files changed