Allow adding user and launching guest mode when all profiles are lock while force sign in is enable…

chrome/browser/ui/webui/signin/md_user_manager_ui.cc

Index: chrome/browser/ui/webui/signin/md_user_manager_ui.cc
diff --git a/chrome/browser/ui/webui/signin/md_user_manager_ui.cc b/chrome/browser/ui/webui/signin/md_user_manager_ui.cc
index a977225dd045ee8c1c9fc9e21bbe14e1c9ae21de..db5c76e7655a1042d4d128022447c3c7a7c2cc97 100644
--- a/chrome/browser/ui/webui/signin/md_user_manager_ui.cc
+++ b/chrome/browser/ui/webui/signin/md_user_manager_ui.cc
@@ -11,6 +11,7 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_shortcut_manager.h"
 #include "chrome/browser/ui/webui/signin/signin_create_profile_handler.h"
+#include "chrome/browser/ui/webui/signin/signin_utils.h"
 #include "chrome/browser/ui/webui/signin/user_manager_screen_handler.h"
 #include "chrome/browser/ui/webui/theme_source.h"
 #include "chrome/common/features.h"
@@ -63,6 +64,7 @@ content::WebUIDataSource* MDUserManagerUI::CreateUIDataSource(
   source->AddLocalizedStrings(localized_strings);
   source->AddBoolean("profileShortcutsEnabled",
                      ProfileShortcutManager::IsFeatureEnabled());
+  source->AddBoolean("isForceSigninEnabled", signin::IsForceSigninEnabled());
 
   source->SetJsonPath("strings.js");