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The added setters are going to be used by a future Cl that implements
the PhoneStatusProcessor class.

Bug: 1106937
Change-Id: Ie95210cfcedbba2ad3ed5875a34ef21a7486b13f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423346
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810084}