dart:io | Change two secure networking tests to account for the session cache.

tests/standalone/io/secure_multiple_client_server_test.dart

Index: tests/standalone/io/secure_multiple_client_server_test.dart
diff --git a/tests/standalone/io/secure_multiple_client_server_test.dart b/tests/standalone/io/secure_multiple_client_server_test.dart
index 63e756a157e12a697152e4dba6411fb6b37134ef..d3adf57e1e43a0f24abef149782821f73b8f7c88 100644
--- a/tests/standalone/io/secure_multiple_client_server_test.dart
+++ b/tests/standalone/io/secure_multiple_client_server_test.dart
@@ -3,9 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 //
 // VMOptions=
+// VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
-// Tests multiple secure connections from a client to a server, hitting
-// the secure connection cache.
+// VMOptions=--short_socket_read --short_socket_write
 
 import "package:expect/expect.dart";
 import "package:path/path.dart";
@@ -33,15 +33,8 @@ Future<SecureServerSocket> startServer() {
   });
 }
 
-// A delay is inserted so that later connections use the secure
-// connection cache to reestablish connection with a shorter handshake.
-Duration delay = new Duration(milliseconds: 0);
-Duration betweenTests = new Duration(milliseconds: 200);
 Future testClient(server, name) {
-  delay += betweenTests;
-  return new Future.delayed(delay).then((_) {
-    return SecureSocket.connect(HOST_NAME, server.port);
-  }).then((socket) {
+  return SecureSocket.connect(HOST_NAME, server.port).then((socket) {
     socket.add("Hello from client $name".codeUnits);
     socket.close();
     return socket.fold(<int>[], (message, data) => message..addAll(data))