dart:io | Add SecureSocket.importPrivateCertificates, that reads a PKCS#12 file.

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) {
+    if (result.exitCode != 0 || !result.stdout.contains("SUCCESS")) {
       print("Client failed with exit code ${result.exitCode}");
-      print("  stdout:");
+      print("  stdout (expects \"SUCCESS\\n\"):");
       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())));