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This patch implements the advanced settings sign-in for the first run
sign-in.

SigninCoordinatorCompletionCallback is updated from:
 typedef void (^SigninCoordinatorCompletionCallback)(
     SigninCoordinatorResult signinResult,
     ChromeIdentity* identity);
to:
using SigninCoordinatorCompletionCallback =
    void (^)(SigninCoordinatorResult result,
             SigninCompletionInfo* info);

The |SigninCompletionInfo| is a class that owns 2 values:
 + |identity|
 + |signinCompletionAction|

SigninCompletionAction is an enum 2 values:
 + SigninCompletionActionNone
 + SigninCompletionActionNeedsAdvancedSettingsSignin

The seconde value is only used for the first run sign-in since it
can't open the advanced settings sign-in as long as the first run is
not finished.

Bug: 971989
Change-Id: Id9041def2bf872c0c10b7d21d7bcfe42eff7960e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130852
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Nohemi Fernandez <fernandex@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757020}