Skip the scheduled test tests on dart2js.

pkg/scheduled_test/test/metatest.dart

 // Copyright (c) 2013, 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.
 
 /// A test library for testing test libraries? We must go deeper.
 ///
 /// Since unit testing code tends to use a lot of global state, it can be tough
 /// to test. This library manages it by running each test case in a child
 /// isolate, then reporting the results back to the parent isolate.
 library metatest;
@@ skipping 97 matching lines @@
   _inChildIsolateFuture = timeout(completer.future, 500, () {
     port.close();
     return false;
   });
   return _inChildIsolateFuture;
 }
 
 /// Runs the test described by [description] in its own isolate. Returns a map
 /// describing the results of that test run.
 Future<Map> _runInIsolate(String description) {
+  // TODO(nweiz): Don't use path here once issue 8440 is fixed.
   var future = spawnUri(path.join(path.current, new Options().script))
       .call(description);
   // TODO(nweiz): Remove this timeout once issue 8417 is fixed and we can
   // capture top-level exceptions.
   return timeout(future, 30 * 1000, () {
     throw 'Timed out waiting for test to complete.';
   });
 }
 
 /// Returns whether [results] (a test result map) describes a test run in which
@@ skipping 67 matching lines @@
         "message": testCase.message,
         "result": testCase.result,
         "stackTrace": testCase.stackTrace
       }).toList()
     });
   }
 
   void onInit() {}
   void onDone(bool success) {}
 }