Try getting the vendor/product from the device itself if it is not a known device.

BUG=chromium-os:29557
TEST=emerge mtpd

Change-Id: I73645badc246a8bcf06997e21a1f4be9b5b82ad3
Reviewed-on: https://gerrit.chromium.org/gerrit/31669
Reviewed-by: Ben Chan <benchan@chromium.org>
Commit-Ready: Lei Zhang <thestig@chromium.org>
Tested-by: Lei Zhang <thestig@chromium.org>
3 files changed