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Today, all Chrome OS users must consent to sync during login. For
the SplitSettingsSync project we want to allow them to use their
device without consenting to browser sync. However, Chrome OS
always sets the IdentityManager primary account during login, which
implies sync consent. We would like to switch to using the
"unconsented" primary account, which exists whether or not the
user has consented to sync.

However, there are a large number of places in the Chrome OS code
that use GetPrimaryAccount() to get the "main" user's account ID,
email or tokens. Add a command line switch that skips setting the
primary account during login and instead directly sets the
"unconsented" primary account. This allows me to manually test
to identify areas that need to change.

Convert some login and ARC ToS code to use the unconsented
primary account. This is a no-op if the switch isn't set, because
without the switch the primary account and unconsented primary
account are the same.

Bug: 1042400
Test: existing automated tests, also sign-in and ARC++ work on
      device without the switch set

Change-Id: Idfeece6ac79b97a102111fb165062614a81f5a9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2001018
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734549}