Fix error where upgrading a closed socket to secure will hang.

sdk/lib/io/secure_socket.dart

Index: sdk/lib/io/secure_socket.dart
diff --git a/sdk/lib/io/secure_socket.dart b/sdk/lib/io/secure_socket.dart
index 44d60849c1bad597ea44f161f6b2a0baeb3e8c8e..1dfd8c5330d3793e471522c6aed1883bcb75fd1a 100644
--- a/sdk/lib/io/secure_socket.dart
+++ b/sdk/lib/io/secure_socket.dart
@@ -558,6 +558,11 @@ class _RawSecureSocket extends Stream<RawSocketEvent>
         throw new ArgumentError(
             "Subscription passed to TLS upgrade is paused");
       }
+      // If we are upgrading a socket that is already closed for read,
+      // report an error as if we received READ_CLOSED during the handshake.
+      if (_socket._socket.closedReadEventSent) {
+        _eventDispatcher(RawSocketEvent.READ_CLOSED);
+      }
       _socketSubscription
           ..onData(_eventDispatcher)
           ..onError(_reportError)