Chromad: Add authentication flow

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

Index: chrome/browser/chromeos/login/screens/user_selection_screen.cc
diff --git a/chrome/browser/chromeos/login/screens/user_selection_screen.cc b/chrome/browser/chromeos/login/screens/user_selection_screen.cc
index fe4456577817112f144e2d351f375a7d8eeb8cbf..6b2a40820f37b6236a4095d0e0e122059abc934b 100644
--- a/chrome/browser/chromeos/login/screens/user_selection_screen.cc
+++ b/chrome/browser/chromeos/login/screens/user_selection_screen.cc
@@ -257,6 +257,10 @@ bool UserSelectionScreen::ShouldForceOnlineSignIn(
   if (is_public_session)
     return false;
 
+  if (user->GetType() == user_manager::USER_TYPE_AD) {
+    return true;
+  }
+
   // At this point the reason for invalid token should be already set. If not,
   // this might be a leftover from an old version.
   if (token_status == user_manager::User::OAUTH2_TOKEN_STATUS_INVALID)