Adapt streams for additional stackTrace argument.

pkg/scheduled_test/lib/scheduled_process.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.
 
 library scheduled_test.scheduled_process;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
@@ skipping 180 matching lines @@
       }), "waiting to reach shouldExit() or kill() for process "
           "'$description'");
     });
   }
 
   /// Converts a stream of bytes to a stream of lines and returns that along
   /// with a [StreamCanceller] controlling it.
   Pair<Stream<String>, StreamCanceller> _lineStreamWithCanceller(
       Future<Stream<List<int>>> streamFuture) {
     return streamWithCanceller(futureStream(streamFuture)
-        .handleError((e) => currentSchedule.signalError(e))
+        .handleError(currentSchedule.signalError)
         .map((chunk) {
       // Whenever the process produces any sort of output, reset the schedule's
       // timer.
       currentSchedule.heartbeat();
       return chunk;
     })
         .transform(_encoding.decoder)
         .transform(new LineSplitter()));
   }
 
@@ skipping 136 matching lines @@
     schedule(() {
       _endExpected = true;
       return _exitCode.then((exitCode) {
         if (expectedExitCode != null) {
           expect(exitCode, equals(expectedExitCode));
         }
       });
     }, "waiting for process '$description' to exit");
   }
 }