Keep track of when a socket has been destroyed

tests/standalone/io/raw_socket_typed_data_test.dart

Index: tests/standalone/io/raw_socket_typed_data_test.dart
diff --git a/tests/standalone/io/raw_socket_typed_data_test.dart b/tests/standalone/io/raw_socket_typed_data_test.dart
index 61f9281c275a27c712706ca9bba581507d5defc3..e843aba104d82db693b52f5b1c884f5129814683 100644
--- a/tests/standalone/io/raw_socket_typed_data_test.dart
+++ b/tests/standalone/io/raw_socket_typed_data_test.dart
@@ -28,6 +28,8 @@ testOutOfRange() {
             client.close();
             server.close();
             break;
+          case RawSocketEvent.CLOSED:
+            break;
           default: throw "Unexpected event $event";
         }
       });
@@ -71,6 +73,8 @@ testOutOfRange() {
             break;
           case RawSocketEvent.READ_CLOSED:
             break;
+          case RawSocketEvent.CLOSED:
+            break;
           default: throw "Unexpected event $event";
         }
       },
@@ -155,6 +159,8 @@ void testSimpleReadWrite() {
           case RawSocketEvent.READ_CLOSED:
             server.close();
             break;
+          case RawSocketEvent.CLOSED:
+            break;
           default: throw "Unexpected event $event";
         }
       });
@@ -194,6 +200,8 @@ void testSimpleReadWrite() {
             verifyTestData(received);
             socket.close();
             break;
+          case RawSocketEvent.CLOSED:
+            break;
           default: throw "Unexpected event $event";
         }
       },