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This CL adds the serial number to cloud reporting, as a step to
transition to using that as the client ID.

Bug: 910594
Change-Id: I7b336da99f2f7304b3e03b7a3a25aa07715749d2
Reviewed-on: https://chromium-review.googlesource.com/c/1354342
Commit-Queue: Georges Khalil <georgesak@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612696}