Create Mojo Struct for user information used in login/lock screen.

chrome/browser/chromeos/login/screens/user_selection_screen.h

Index: chrome/browser/chromeos/login/screens/user_selection_screen.h
diff --git a/chrome/browser/chromeos/login/screens/user_selection_screen.h b/chrome/browser/chromeos/login/screens/user_selection_screen.h
index f9cc031c5c9e6bed40fd2ee470c25a40a51eba74..5a88270129785d08727b543ebbfb18bebb7c7a99 100644
--- a/chrome/browser/chromeos/login/screens/user_selection_screen.h
+++ b/chrome/browser/chromeos/login/screens/user_selection_screen.h
@@ -9,6 +9,7 @@
 #include <string>
 #include <vector>
 
+#include "ash/public/interfaces/lock_screen.mojom.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/timer/timer.h"
@@ -115,7 +116,18 @@ class UserSelectionScreen
   // Determines if user auth status requires online sign in.
   static bool ShouldForceOnlineSignIn(const user_manager::User* user);
 
-  std::unique_ptr<base::ListValue> PrepareUserList();
+  // Fills |user_info| with information about |user|.
+  // TODO: Public sesssions exist in login screen, but not lock screen.
+  // We will need public session locales in the future when we change login
+  // screen to view-based as well. See crbug.com/732452.
+  static void FillUserMojoStruct(const user_manager::User* user,
+                                 bool is_owner,
+                                 bool is_signin_to_add,
+                                 AuthType auth_type,
+                                 ash::mojom::LoginUserInfo* user_info);
+
+  std::unique_ptr<base::ListValue> UpdateAndReturnUserListForWebUI();
+  std::vector<ash::mojom::LoginUserInfoPtr> UpdateAndReturnUserListForMojo();
 
  protected:
   UserBoardView* view_ = nullptr;