Merge IO v2 branch to bleeding edge

sdk/lib/io/process.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.
 
 part of dart.io;
 
 // TODO(ager): The only reason for this class is that we
 // cannot patch a top-level at this point.
 class _ProcessUtils {
   external static _exit(int status);
@@ skipping 66 matching lines @@
   external static Future<ProcessResult> run(String executable,
                                             List<String> arguments,
                                             [ProcessOptions options]);
 
   /**
    * Returns an input stream of the process stdout.
    *
    * Throws an [UnsupportedError] if the process is
    * non-interactive.
    */
-  InputStream get stdout;
+  Stream<List<int>> get stdout;
 
   /**
    * Returns an input stream of the process stderr.
    *
    * Throws an [UnsupportedError] if the process is
    * non-interactive.
    */
-  InputStream get stderr;
+  Stream<List<int>> get stderr;
 
   /**
    * Returns an output stream to the process stdin.
    *
    * Throws an [UnsupportedError] if the process is
    * non-interactive.
    */
-  OutputStream get stdin;
+  IOSink<Process> get stdin;
 
   /**
    * Sets an exit handler which gets invoked when the process
    * terminates.
    *
    * Throws an [UnsupportedError] if the process is
    * non-interactive.
    */
-  void set onExit(void callback(int exitCode));
+  Future<int> exitCode;
 
   /**
    * On Windows, [kill] kills the process, ignoring the [signal]
    * flag. On Posix systems, [kill] sends [signal] to the
    * process. Depending on the signal giving, it'll have different
    * meanings. When the process terminates as a result of calling
    * [kill] [onExit] is called.
    *
    * Returns [:true:] if the process is successfully killed (the
    * signal is successfully sent). Returns [:false:] if the process
@@ skipping 136 matching lines @@
   /**
    * Contains the system message for the process exception if any.
    */
   final String message;
 
   /**
    * Contains the OS error code for the process exception if any.
    */
   final int errorCode;
 }