Keep track of when a socket has been destroyed

runtime/bin/eventhandler_win.cc

Index: runtime/bin/eventhandler_win.cc
diff --git a/runtime/bin/eventhandler_win.cc b/runtime/bin/eventhandler_win.cc
index 6819fce44ee4fb2a76f0eda7724d23b0de2ea25a..597eb8f41a8c6bafe834072285fab420f49d8f42 100644
--- a/runtime/bin/eventhandler_win.cc
+++ b/runtime/bin/eventhandler_win.cc
@@ -632,7 +632,9 @@ void ClientSocket::DisconnectComplete(IOBuffer* buffer) {
     IOBuffer::DisposeBuffer(data_ready_);
   }
   // When disconnect is complete get rid of the object.
+  Dart_Port port = port();
   delete this;
+  DartUtils::PostInt32(port, 1 << kDestroyedEvent);
 }
 
 
@@ -750,7 +752,9 @@ void EventHandlerImplementation::HandleInterrupt(InterruptMessage* msg) {
       }
     }
     if (delete_handle) {
+      Dart_Port port = handle->port();
       delete handle;
+      DartUtils::PostInt32(port, 1 << kDestroyedEvent);
     }
   }
 }
@@ -768,7 +772,9 @@ void EventHandlerImplementation::HandleAccept(ListenSocket* listen_socket,
   }
 
   if (listen_socket->IsClosed()) {
+    Dart_Port port = listen_socket->port();
     delete listen_socket;
+    DartUtils::PostInt32(port, 1 << kDestroyedEvent);
   }
 }
 
@@ -813,7 +819,9 @@ void EventHandlerImplementation::HandleRead(Handle* handle,
   }
 
   if (handle->IsClosed()) {
+    Dart_Port port = handle->port();
     delete handle;
+    DartUtils::PostInt32(port, 1 << kDestroyedEvent);
   }
 }
 
@@ -837,7 +845,9 @@ void EventHandlerImplementation::HandleWrite(Handle* handle,
   }
 
   if (handle->IsClosed()) {
+    Dart_Port port = handle->port();
     delete handle;
+    DartUtils::PostInt32(port, 1 << kDestroyedEvent);
   }
 }