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This change added 'Device' tab to the chrome://usb-internals page, and
can display all the real devices that connected to the machine.

Bug: 928923
Change-Id: Ie1f3c2dcea69dabdfb43ea5dbe1ae516573cd694
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1473710
Commit-Queue: Nancy Li <nancyly@google.com>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638712}