Split dart:builtin into dart:builtin and dart:io.

samples/total/src/Dartc.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
 #library("total:dartc");
 
+#import('dart:io');
+
 /**
  * A simple wrapper around dartc.
  * TODO: automatically determine the exec path to dartc
  * TODO: prevent ANSI colors from being exposed to the user
  */
 class Dartc {
   final String DARTC_EXEC_PATH = '../../../out/Release_ia32/dartc';
 
   String scriptName;
   String work = null;
@@ skipping 40 matching lines @@
     compiler.stderr.dataHandler = () => _readAll(compiler.stderr, messages);
   }
 }
 
 void _readAll(InputStream input, StringBuffer output) {
   while (input.available() != 0) {
     output.add(new String.fromCharCodes(input.read()));
   }
 }