Change the process API to be completely asynchronous.

samples/total/src/Dartc.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.
 
 #library("total:dartc");
 
 /**
  * A simple wrapper around dartc.
  * TODO: automatically determine the exec path to dartc
  * TODO: prevent ANSI colors from being exposed to the user
@@ skipping 28 matching lines @@
       args.add('-fatal-type-errors');
     }
     if (optimize) {
       args.add('-optimize');
     }
     if (checkOnly) {
       args.add('-check-only');
     }
     args.add(scriptName);
 
-    Process compiler = new Process(DARTC_EXEC_PATH, args);
-
+    Process compiler = new Process.start(DARTC_EXEC_PATH, args);
     StringBuffer messages = new StringBuffer();
     compiler.exitHandler = (int status) {
-        compiler.close();
-        callback(status, messages.toString());
-      };
-
-    compiler.start();
+      compiler.close();
+      callback(status, messages.toString());
+    };
 
     compiler.stdout.dataHandler = () => _readAll(compiler.stdout, messages);
     compiler.stderr.dataHandler = () => _readAll(compiler.stderr, messages);
   }
 }
 
 void _readAll(InputStream input, StringBuffer output) {
   while (input.available() != 0) {
     output.add(new String.fromCharCodes(input.read()));
   }
 }