Merge IO v2 branch to bleeding edge

tests/standalone/io/process_working_directory_test.dart

 // Copyright (c) 2012, 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.
 //
 // Process working directory test.
 
 library ProcessWorkingDirectoryTest;
 import "dart:io";
 import "process_test_util.dart";
 
 class ProcessWorkingDirectoryTest {
   static String get fullTestFilePath {
     // Extract full path, since we run processes from another directory.
     File path = new File(getProcessTestFileName());
     Expect.isTrue(path.existsSync());
     return path.fullPathSync();
   }
 
   static void testValidDirectory() {
     Directory directory = new Directory("").createTempSync();
     Expect.isTrue(directory.existsSync());
 
     var options = new ProcessOptions();
     options.workingDirectory = directory.path;
     var processFuture =
         Process.start(fullTestFilePath, const ["0", "0", "99", "0"], options);
     processFuture.then((process) {
-      process.onExit = (int exitCode) {
+      process.exitCode.then((int exitCode) {
         Expect.equals(exitCode, 99);
         directory.deleteSync();
-      };
-      process.stdout.onData = process.stdout.read;
-      process.stderr.onData = process.stderr.read;
+      });
+      process.stdout.listen((_) {});
+      process.stderr.listen((_) {});
     }).catchError((error) {
       directory.deleteSync();
       Expect.fail("Couldn't start process");
     });
   }
 
   static void testInvalidDirectory() {
     Directory directory = new Directory("").createTempSync();
     Expect.isTrue(directory.existsSync());
 
@@ skipping 11 matching lines @@
     });
   }
 }
 
 
 
 main() {
   ProcessWorkingDirectoryTest.testValidDirectory();
   ProcessWorkingDirectoryTest.testInvalidDirectory();
 }