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Sign-in UI cannot be dismiss without asynchronous calls. This was
previously ignored. The new architecture is more strict, don't allow
to ignore callbacks.
To prepare the transition to the new architecture, all sign-in UI has
to be managed by the SceneController.
The SceneController already supports asynchronous dismiss of the sign-in
UI.

Adding AUTHENTICATION_OPERATION_ADD_ACCOUNT command to add secondary
accounts.

   crrev.com/c/2161007 GoogleServicesCoordinator
=> crrev.com/c/2160911 AccountTableViewController
   crrev.com/c/2161027 SettingsTableViewController
   crrev.com/c/2165732 Fixing tests

Bug: 971989
Change-Id: I8306a2d8613992bbf750abbe2a90a1ab4a1ac641
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2160911
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Nohemi Fernandez <fernandex@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763572}