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This change adds a section to chrome://device-log for the Serial API.
Existing error messages are now directed here and the platform-specific
enumeration backends have been updated to generate log entries when
devices are added and removed, as is done for other device types.

Bug: 1107826
Change-Id: I694b42fe82b96c44257c979b8a2ea276b34f3124
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436277
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811531}