Add LogoutConfirmationController to show LogoutConfirmationDialogs

ash/ash.gyp

Index: ash/ash.gyp
diff --git a/ash/ash.gyp b/ash/ash.gyp
index fe1b0e09ac73b3d38818e9b61565b7a54b95d1dd..d5537a88ed7c11b4a5b44e3dca16e9119301c960 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -368,8 +368,10 @@
         'system/logout_button/logout_button_observer.h',
         'system/logout_button/logout_button_tray.cc',
         'system/logout_button/logout_button_tray.h',
-        'system/logout_button/logout_confirmation_dialog_view.cc',
-        'system/logout_button/logout_confirmation_dialog_view.h',
+        'system/logout_confirmation/logout_confirmation_controller.cc',
+        'system/logout_confirmation/logout_confirmation_controller.h',
+        'system/logout_confirmation/logout_confirmation_dialog.cc',
+        'system/logout_confirmation/logout_confirmation_dialog.h',

[stevenjb, 2014/02/27 17:58:44]

Are logout_button and logout_conformation related at this point? It seems a bit
confusing to have two separate directories, maybe we can put them all in a
'logout' directory?

[bartfab (slow), 2014/02/28 12:13:49]

As of this CL, the logout button is the only class that uses the logout
confirmation dialog. But I am doing this whole refactoring only because my next
CL is adding another consumer of the dialog. If you want me to, I can still move
all the classes into a joint "logout" directory but that would imply a stronger
relationship between dialog and button than there really is.

[stevenjb, 2014/03/04 23:33:29]

I wouldn't say that implies a strong relationship, I would just prefer to keep
the number of subfolders under ash/system reasonable; it doens't make sense to
have a folder for every class. Maybe a better grouping would be
ash/system/session and everything logout and session_length_limit related could
be moved there. That can be in a separate CL however.

[bartfab (slow), 2014/03/05 18:19:44]

Moving everything under ash/system/session makes sense. I modified the CL do to
this move straight away.

         'system/monitor/tray_monitor.cc',
         'system/monitor/tray_monitor.h',
         'system/session_length_limit/session_length_limit_observer.h',
@@ -923,7 +925,7 @@
         'system/chromeos/screen_security/screen_tray_item_unittest.cc',
         'system/chromeos/tray_display_unittest.cc',
         'system/date/date_view_unittest.cc',
-        'system/logout_button/logout_button_tray_unittest.cc',
+        'system/logout_confirmation/logout_confirmation_controller_unittest.cc',
         'system/session_length_limit/tray_session_length_limit_unittest.cc',
         'system/tray/system_tray_unittest.cc',
         'system/tray/tray_details_view_unittest.cc',