isolates refactor: this change introduces 'dart:isolate' as a library. This is a

tests/standalone/src/ListInputStreamTest.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.
 
 #import("dart:io");
+#import("dart:isolate");
 
 void testEmptyListInputStream() {
   InputStream stream = new ListInputStream();
   stream.write([]);
   stream.markEndOfStream();
   ReceivePort donePort = new ReceivePort();
 
   void onData() {
     throw "No data expected";
   }
@@ skipping 265 matching lines @@
   testListInputStream1();
   testListInputStream2();
   testListInputStreamPipe1();
   testListInputStreamPipe2();
   testListInputClose1();
   testListInputClose2();
   testDynamicListInputStream();
   testDynamicListInputClose1();
   testDynamicListInputClose2();
 }