Increase barback scheduled_test timeout for many_parallel_transformers test.

pkg/scheduled_test/lib/scheduled_test.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.
 
 // TODO(nweiz): Add support for calling [schedule] while the schedule is already
 // running.
 // TODO(nweiz): Port the non-Pub-specific scheduled test libraries from Pub.
 /// A package for writing readable tests of asynchronous behavior.
 ///
 /// ## Installing ##
@@ skipping 156 matching lines @@
 ///           expect(request.body, equals('payload'));
 ///           expect(request.headers['content-type'], equals('text/plain'));
 ///         }));
 ///
 ///         schedule(() => sendRequest('payload'));
 ///       });
 ///     }
 ///
 /// ## Timeouts
 ///
-/// `scheduled_test` has a built-in timeout of 30 seconds (configurable via
+/// `scheduled_test` has a built-in timeout of 5 seconds (configurable via
 /// [Schedule.timeout]). This timeout is aware of the structure of the schedule;
 /// this means that it will reset for each task in a queue, when moving between
 /// queues, or almost any other sort of interaction with [currentSchedule]. As
 /// long as the [Schedule] knows your test is making some sort of progress, it
 /// won't time out.
 ///
 /// If a single task might take a long time, you can also manually tell the
 /// [Schedule] that it's making progress by calling [Schedule.heartbeat], which
 /// will reset the timeout whenever it's called.
 ///
@@ skipping 182 matching lines @@
 /// [description] provides an optional description of the future, which is
 /// used when generating error messages.
 Future wrapFuture(Future future, [String description]) {
   if (currentSchedule == null) {
     throw new StateError("Unexpected call to wrapFuture with no current "
         "schedule.");
   }
 
   return currentSchedule.wrapFuture(future, description);
 }