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ARC needs to know the identity of the primary account, but it cannot
retrieve that from Android account manager.

Add a mojo method in ArcAuthService for returning the primary account
information from Chrome OS.

Bug: b/141108534
Test: browser_tests --gtest_filter="*Arc*AuthService*Test*"
Change-Id: I01ec976a330d52421ab2ddfe5155c712c81967af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810359
Commit-Queue: Anastasiia Nikolaienko <anastasiian@chromium.org>
Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Reviewed-by: Kush Sinha <sinhak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726738}