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This change updates the serial port enumerators for Linux and macOS to
read the serial number (if available) for USB devices and use this to
construct a persistent ID for these devices.

This means that only USB devices will have permissions stored
persistently. Support for remembering other types of devices will be
investigated in the future.

Bug: 908836
Change-Id: I28c53b880e69723447c445d447d677f2799c2ebd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2265357
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782158}