GitLab

The generated serial is stored in SharedPreferences in order to keep it
consistent between reboots.

Bug: internal b/111077464
Test: look at logs
Change-Id: If988936bedd4fe9a9946ef2671a747dfc622ecf7
Reviewed-on: https://chromium-review.googlesource.com/1237524
Commit-Queue: Thoren Paulson <thoren@chromium.org>
Reviewed-by: Simeon Anfinrud <sanfin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594392}