diff --git a/third_party/blink/renderer/core/html/closewatcher/close_watcher.cc b/third_party/blink/renderer/core/html/closewatcher/close_watcher.cc
index 2ad0d2334f517..5d1624c132d07 100644
--- a/third_party/blink/renderer/core/html/closewatcher/close_watcher.cc
+++ b/third_party/blink/renderer/core/html/closewatcher/close_watcher.cc
@@ -165,15 +165,20 @@ void CloseWatcher::WatcherStack::EscapeKeyHandler(KeyboardEvent* event) {
 void CloseWatcher::WatcherStack::Signal() {
   DCHECK(AnyEnabledWatchers())
       << "If there aren't watchers enabled, the mojo pipe should be reset";
+  LOG(ERROR)<<__func__<<"begin===\n";
   auto& group = watcher_groups_.back();
+  LOG(ERROR)<<__func__<<" , group "<< group.size() << " tname-> " << base::PlatformThread::GetName()<<"\n";
   for (auto& watcher : base::Reversed(group)) {
+    LOG(ERROR)<<__func__<<" , before RequestClose, group.size-> "<< group.size() << " tname-> " << base::PlatformThread::GetName()<<"\n";
     if (!watcher->RequestClose(AllowCancel::kWithUserActivation)) {
       break;
     }
+    LOG(ERROR)<<__func__<<" , after RequestClose,  group.size-> "<< group.size() << " tname-> " << base::PlatformThread::GetName()<<"\n";
   }
   if (allowed_groups_ > 1) {
     --allowed_groups_;
   }
+  LOG(ERROR)<<__func__<<"end===\n";
 }
 
 void CloseWatcher::WatcherStack::Trace(Visitor* visitor) const {