Move all typecasting code to individual screens.

chrome/chrome_browser_chromeos.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
       'target_name': 'browser_chromeos',
       'type': 'static_library',
@@ skipping 558 matching lines @@
         'browser/chromeos/login/login_utils.cc',
         'browser/chromeos/login/login_utils.h',
         'browser/chromeos/login/login_wizard.h',
         'browser/chromeos/login/profile_auth_data.cc',
         'browser/chromeos/login/profile_auth_data.h',
         'browser/chromeos/login/proxy_settings_dialog.h',
         'browser/chromeos/login/saml/saml_offline_signin_limiter.cc',
         'browser/chromeos/login/saml/saml_offline_signin_limiter.h',
         'browser/chromeos/login/saml/saml_offline_signin_limiter_factory.cc',
         'browser/chromeos/login/saml/saml_offline_signin_limiter_factory.h',
+        'browser/chromeos/login/screen_manager.cc',
+        'browser/chromeos/login/screen_manager.h',
         'browser/chromeos/login/screens/base_screen.cc',
         'browser/chromeos/login/screens/base_screen.h',
         'browser/chromeos/login/screens/chrome_user_selection_screen.cc',
         'browser/chromeos/login/screens/chrome_user_selection_screen.h',
+        'browser/chromeos/login/screens/controller_pairing_screen.cc',
+        'browser/chromeos/login/screens/controller_pairing_screen.h',
         'browser/chromeos/login/screens/controller_pairing_screen_actor.cc',
         'browser/chromeos/login/screens/controller_pairing_screen_actor.h',
-        'browser/chromeos/login/screens/controller_pairing_screen.cc',
-        'browser/chromeos/login/screens/controller_pairing_screen.h',
         'browser/chromeos/login/screens/core_oobe_actor.h',
         'browser/chromeos/login/screens/error_screen.cc',
         'browser/chromeos/login/screens/error_screen.h',
         'browser/chromeos/login/screens/error_screen_actor.cc',
         'browser/chromeos/login/screens/error_screen_actor.h',
         'browser/chromeos/login/screens/error_screen_actor_delegate.h',
         'browser/chromeos/login/screens/eula_screen.cc',
         'browser/chromeos/login/screens/eula_screen.h',
         'browser/chromeos/login/screens/eula_screen_actor.h',
         'browser/chromeos/login/screens/gaia_screen.cc',
@@ skipping 68 matching lines @@
         'browser/chromeos/login/signin/oauth2_token_fetcher.cc',
         'browser/chromeos/login/signin/oauth2_token_fetcher.h',
         'browser/chromeos/login/signin_specifics.cc',
         'browser/chromeos/login/signin_specifics.h',
         'browser/chromeos/login/startup_utils.cc',
         'browser/chromeos/login/startup_utils.h',
         'browser/chromeos/login/supervised/supervised_user_authentication.cc',
         'browser/chromeos/login/supervised/supervised_user_authentication.h',
         'browser/chromeos/login/supervised/supervised_user_authenticator.cc',
         'browser/chromeos/login/supervised/supervised_user_authenticator.h',
+        'browser/chromeos/login/supervised/supervised_user_constants.cc',
+        'browser/chromeos/login/supervised/supervised_user_constants.h',
         'browser/chromeos/login/supervised/supervised_user_creation_controller.cc',
         'browser/chromeos/login/supervised/supervised_user_creation_controller.h',
         'browser/chromeos/login/supervised/supervised_user_creation_controller_new.cc',
         'browser/chromeos/login/supervised/supervised_user_creation_controller_new.h',
-        'browser/chromeos/login/supervised/supervised_user_constants.cc',
-        'browser/chromeos/login/supervised/supervised_user_constants.h',
         'browser/chromeos/login/supervised/supervised_user_creation_flow.cc',
         'browser/chromeos/login/supervised/supervised_user_creation_flow.h',
         'browser/chromeos/login/supervised/supervised_user_creation_screen.cc',
         'browser/chromeos/login/supervised/supervised_user_creation_screen.h',
         'browser/chromeos/login/supervised/supervised_user_login_flow.cc',
         'browser/chromeos/login/supervised/supervised_user_login_flow.h',
         'browser/chromeos/login/ui/captive_portal_view.cc',
         'browser/chromeos/login/ui/captive_portal_view.h',
         'browser/chromeos/login/ui/captive_portal_window_proxy.cc',
         'browser/chromeos/login/ui/captive_portal_window_proxy.h',
@@ skipping 508 matching lines @@
         'browser/chromeos/attestation/attestation_signed_data.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/attestation',
         'proto_out_dir': 'chrome/browser/chromeos/attestation',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }