GitLab

This cl records the accepted edu coexistence terms
of service version number in user pref. The stored pref
is a dictionary mapping the secondary edu account's gaia id to
the accepted terms of service version number.

Bug: 1134682
Change-Id: I73cf4872c6bddec0f7a92663b9a5cacb0a014567
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510874Reviewed-by: Aga Wronska <agawronska@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Yilkal Abe <yilkal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822873}