Add SecureSocket.addCertificate.

tests/standalone/io/certificate_test.dart

+// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// This test verifies that a server certificate can be verified by a client
+// that loads the certificate authority certificate it depends on at runtime.
+
+import "package:path/path.dart";
+import "dart:io";
+import "dart:async";
+
+String scriptDir = dirname(new Options().script);
+
+void main() {
+  SecureSocket.initialize(database: join(scriptDir, 'pkcert'),
+                          password: 'dartdart');
+  runServer().then((SecureServerSocket server) {
+    return Process.run(new Options().executable,
+                       ['--checked',
+                        join(scriptDir, 'certificate_test_client.dart'),
+                        server.port.toString(),
+                        join(scriptDir, 'pkcert', 'myauthority.pem')]);
+  }).then((ProcessResult result) {
+    if (result.exitCode != 0) {
+      print("Client failed with exit code ${result.exitCode}");
+      print("  stdout:");
+      print(result.stdout);
+      print("  stderr:");
+      print(result.stderr);
+      throw new AssertionError();
+    }
+  });
+}
+
+Future<SecureServerSocket> runServer() =>
+  SecureServerSocket.bind("localhost", 0, "localhost_cert")
+    .then((server) => server..listen(
+        (socket) => socket.pipe(socket).then((_) => server.close())));