Re-land "Mash cleanup: begin converting login mojo to C++"

This re-lands db977c4b6c6bc31bd6d601273acc921435edda83

Change to original: LoginUserInfo::fingerprint_state is
default initialized

Original change's description:
> Mash cleanup: begin converting login mojo to C++
>
> This patch moves types implemented in login_user_info.mojom to
> //ash/public/cpp/login_types.h. The handful of methods on
> mojom::LoginScreen which used these types are moved to C++
> interfaces.
>
> There are two new public-facing C++ interfaces:
> 1. ash::LoginScreen, which is a direct translation of the mojom.
>    This is implemented by ash::LoginScreenController.
> 2. ash::LoginScreenModel, which is used for the methods that
>    were simple thunks in LoginScreenController.
>    (LoginDataDispatcher implements this interface.)
>
> Bug: 958206
> Change-Id: I329d606b234556bf05aee40849f3aa5ccc6c0be0

TBR=tsepez@chromium.org,xiyuan@chromium.org

Bug: 958206
Change-Id: I9567af3331638e38590f143f1b43e55d4b609c81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626700
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662757}

• ash/DEPS[diff]
• ash/detachable_base/detachable_base_handler.cc[diff]
• ash/detachable_base/detachable_base_handler.h[diff]
• ash/detachable_base/detachable_base_handler_unittest.cc[diff]
• ash/detachable_base/detachable_base_notification_controller.cc[diff]
• ash/detachable_base/detachable_base_notification_controller_unittest.cc[diff]
• ash/login/login_screen_controller.cc[diff]
• ash/login/login_screen_controller.h[diff]
• ash/login/login_screen_controller_observer.cc[diff]
• ash/login/login_screen_controller_observer.h[diff]
• ash/login/login_screen_test_api.cc[diff]
• ash/login/ui/fake_login_detachable_base_model.cc[diff]
• ash/login/ui/fake_login_detachable_base_model.h[diff]
• ash/login/ui/lock_contents_view.cc[diff]
• ash/login/ui/lock_contents_view.h[diff]
• ash/login/ui/lock_contents_view_unittest.cc[diff]
• ash/login/ui/lock_debug_view.cc[diff]
• ash/login/ui/lock_screen_sanity_unittest.cc[diff]
• ash/login/ui/login_auth_user_view.cc[diff]
• ash/login/ui/login_auth_user_view.h[diff]
• ash/login/ui/login_auth_user_view_unittest.cc[diff]
• ash/login/ui/login_big_user_view.cc[diff]
• ash/login/ui/login_big_user_view.h[diff]
• ash/login/ui/login_data_dispatcher.cc[diff]
• ash/login/ui/login_data_dispatcher.h[diff]
• ash/login/ui/login_detachable_base_model.cc[diff]
• ash/login/ui/login_detachable_base_model.h[diff]
• ash/login/ui/login_expanded_public_account_view.cc[diff]
• ash/login/ui/login_expanded_public_account_view.h[diff]
• ash/login/ui/login_expanded_public_account_view_unittest.cc[diff]
• ash/login/ui/login_keyboard_test_base.h[diff]
• ash/login/ui/login_password_view.cc[diff]
• ash/login/ui/login_password_view.h[diff]
• ash/login/ui/login_password_view_test.cc[diff]
• ash/login/ui/login_public_account_user_view.cc[diff]
• ash/login/ui/login_public_account_user_view.h[diff]
• ash/login/ui/login_public_account_user_view_unittest.cc[diff]
• ash/login/ui/login_test_base.cc[diff]
• ash/login/ui/login_test_base.h[diff]
• ash/login/ui/login_test_utils.cc[diff]
• ash/login/ui/login_test_utils.h[diff]
• ash/login/ui/login_user_view.cc[diff]
• ash/login/ui/login_user_view.h[diff]
• ash/login/ui/login_user_view_unittest.cc[diff]
• ash/login/ui/scrollable_users_list_view.cc[diff]
• ash/login/ui/scrollable_users_list_view.h[diff]
• ash/public/cpp/BUILD.gn[diff]
• ash/public/cpp/login_screen.cc[Added - diff]
• ash/public/cpp/login_screen.h[Added - diff]
• ash/public/cpp/login_screen_model.cc[Added - diff]
• ash/public/cpp/login_screen_model.h[Added - diff]
• ash/public/cpp/login_types.cc[Added - diff]
• ash/public/cpp/login_types.h[Added - diff]
• ash/public/cpp/session/user_info.cc[diff]
• ash/public/cpp/session/user_info.h[diff]
• ash/public/interfaces/BUILD.gn[diff]
• ash/public/interfaces/login_screen.mojom[diff]
• ash/public/interfaces/login_user_info.mojom[Deleted - diff]
• ash/public/interfaces/typemaps.gni[diff]
• ash/public/interfaces/user_info.mojom[Deleted - diff]
• ash/public/interfaces/user_info.typemap[Deleted - diff]
• ash/public/interfaces/user_info_traits.h[diff]
• ash/public/interfaces/wallpaper.mojom[diff]
• ash/public/interfaces/wallpaper.typemap[diff]
• ash/session/session_controller_impl.cc[diff]
• ash/shelf/login_shelf_view.cc[diff]
• ash/shelf/login_shelf_view.h[diff]
• chrome/browser/chromeos/login/lock/screen_locker.cc[diff]
• chrome/browser/chromeos/login/lock/screen_locker.h[diff]
• chrome/browser/chromeos/login/lock/screen_locker_unittest.cc[diff]
• chrome/browser/chromeos/login/lock/views_screen_locker.cc[diff]
• chrome/browser/chromeos/login/lock/views_screen_locker.h[diff]
• chrome/browser/chromeos/login/lock_screen_utils.cc[diff]
• chrome/browser/chromeos/login/lock_screen_utils.h[diff]
• chrome/browser/chromeos/login/screens/user_selection_screen.cc[diff]
• chrome/browser/chromeos/login/screens/user_selection_screen.h[diff]
• chrome/browser/chromeos/login/ui/login_display_mojo.cc[diff]
• chrome/browser/chromeos/login/ui/login_display_mojo.h[diff]
• chrome/browser/chromeos/login/user_board_view_mojo.cc[diff]
• chrome/browser/chromeos/login/users/multi_profile_user_controller.cc[diff]
• chrome/browser/chromeos/login/users/multi_profile_user_controller.h[diff]
• chrome/browser/ui/BUILD.gn[diff]
• chrome/browser/ui/ash/login_screen_client.cc[diff]
• chrome/browser/ui/ash/test_login_screen.cc[diff]
• chrome/browser/ui/ash/test_login_screen.h[diff]
• chrome/browser/ui/ash/test_login_screen_model.cc[Added - diff]
• chrome/browser/ui/ash/test_login_screen_model.h[Added - diff]