Increase size for slow-consumer test (overflows memory on X64).

tests/lib/async/slow_consumer_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=32
+// VMOptions=--old_gen_heap_size=64
 
 library slow_consumer_test;
 
 import 'dart:async';
 import 'dart:isolate';
 
 const int KB = 1024;
 const int MB = KB * KB;
 const int GB = KB * KB * KB;
 
@@ skipping 37 matching lines @@
   int targetCount;
   StreamController controller;
   Timer pendingSend;
 
   DataProvider(int this.bytesPerSecond, int this.targetCount, this.chunkSize) {
     controller = new StreamController(onPauseStateChange: onPauseStateChange);
     Timer.run(send);
   }
 
   Stream get stream => controller.stream;
+
   send() {
     if (pendingSend != null) {
       pendingSend.cancel();
       pendingSend = null;
     }
     if (controller.isPaused) return;
     if (sentCount == targetCount) {
       controller.close();
       return;
     }
@@ skipping 17 matching lines @@
     send();
   }
 }
 
 main() {
   var port = new ReceivePort();
   // The data provider can deliver 800MB/s of data. It sends 100MB of data to
   // the slower consumer who can only read 200MB/s. The data is sent in 1MB
   // chunks.
   //
-  // This test is limited to 32MB of heap-space (see VMOptions on top of the
+  // This test is limited to 64MB of heap-space (see VMOptions on top of the
   // file). If the consumer doesn't pause the data-provider it will run out of
   // heap-space.
 
   new DataProvider(800 * MB, 100 * MB, 1 * MB).stream
     .pipe(new SlowConsumer(200 * MB))
     .then((count) {
       port.close();
       Expect.equals(100 * MB, count);
     });
 }