[sync] Display an error when sync settings aren't confirmed

components/browser_sync/profile_sync_service.cc

Index: components/browser_sync/profile_sync_service.cc
diff --git a/components/browser_sync/profile_sync_service.cc b/components/browser_sync/profile_sync_service.cc
index ecfbbbd7046594412a99b8da5365d0e7886a4d17..6efd0397c036c4c31812accbb4f2e58031e8a55e 100644
--- a/components/browser_sync/profile_sync_service.cc
+++ b/components/browser_sync/profile_sync_service.cc
@@ -786,6 +786,12 @@ void ProfileSyncService::SetFirstSetupComplete() {
   }
 }
 
+bool ProfileSyncService::IsSyncConfirmationNeeded() const {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  return !IsFirstSetupInProgress() && !IsFirstSetupComplete() &&
+         IsSyncRequested();
+}
+
 void ProfileSyncService::UpdateLastSyncedTime() {
   sync_prefs_.SetLastSyncedTime(base::Time::Now());
 }