GitLab

Add the following mojo api for chrome to send public session information
to LockContentsView in ash.
1. SetPublicSessionDisplayName
2. SetPublicSessionLocales

These api will be used in a follow-up CL:
https://chromium-review.googlesource.com/c/chromium/src/+/940623

Bug: 809635
Change-Id: I7b83d7188155c4c8547e8fef91aa53121dc760b3
Reviewed-on: https://chromium-review.googlesource.com/941516Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Xiaoyin Hu <xiaoyinh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541269}