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During the migration to IdentityManager, we noticed that some Arc*
related tests setup are incomplete, such that they will potentially fail
after IdentityManager migration.

This CL adds more initial test setup to seed AccountTrackerService and
SigninManager properly. No behavior or logic change.

Bug: 883318, 892116
Change-Id: I4db443d7bd0c7df396e1c188743b869d2b9c2e82
Reviewed-on: https://chromium-review.googlesource.com/c/1265079Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Commit-Queue: Jialiu Lin <jialiul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597361}