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The initial implementation creates and persists a device name at
startup, but this is not yet used anywhere else.

Bug: 126802
Test: DeviceNameStoreTest.*
Change-Id: Ibd185803947e90b53f87a789c4d4727e538d3a8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523741
Commit-Queue: James Hawkins <jhawkins@chromium.org>
Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827041}