Implement the full process interface for Windows

tests/dart/src/ProcessExitNegativeTest.dart

 // Copyright (c) 2011, 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 test program to test that compilation errors in the process
 // exit handler is reported correctly.
 
 void main() {
-  Process p = new Process("true", []);
+  Process p = new Process("Debug_ia32\\process_test.exe",
+                           const ["0", "0", "99", "0"]);
   p.setExitHandler(
     (int s) {
       print(a.toString());  // Should cause a compilation error here.
       p.close();
     }
   );
   p.start();
 }