Migrated test block 171 to Dart 2.0.

tests/lib_2/async/slow_consumer3_test.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.
 
 // VMOptions=--old_gen_heap_size=64
 
 library slow_consumer3_test;
 
 import 'package:async_helper/async_helper.dart';
 import "package:expect/expect.dart";
 import 'dart:async';
 
 const int KB = 1024;
 const int MB = KB * KB;
 const int GB = KB * KB * KB;
 
-class SlowConsumer extends StreamConsumer {
+class SlowConsumer extends StreamConsumer<List> {

[Bob Nystrom, 2017/08/23 21:49:32]

Use List<int> here and below?

   int receivedCount = 0;
   final int bytesPerSecond;
   final int bufferSize;
   final List bufferedData = [];
   int usedBufferSize = 0;
   int finalCount;
 
   SlowConsumer(int this.bytesPerSecond, int this.bufferSize);
 
   Future consume(Stream stream) {
@@ skipping 55 matching lines @@
   // file). If the consumer doesn't pause the data-provider it will run out of
   // heap-space.
 
   dataGenerator(100 * MB, 512 * KB)
       .pipe(new SlowConsumer(200 * MB, 3 * MB))
       .then((count) {
     Expect.equals(100 * MB, count);
     asyncEnd();
   });
 }