Increase barback scheduled_test timeout for many_parallel_transformers test.

pkg/barback/test/package_graph/many_parallel_transformers_test.dart

Index: pkg/barback/test/package_graph/many_parallel_transformers_test.dart
diff --git a/pkg/barback/test/package_graph/many_parallel_transformers_test.dart b/pkg/barback/test/package_graph/many_parallel_transformers_test.dart
index 389beb15b44bcdbdad9d1b65386e6b7583753b22..b16d5d06cc42926c737a07ea3d538017dc2ff129 100644
--- a/pkg/barback/test/package_graph/many_parallel_transformers_test.dart
+++ b/pkg/barback/test/package_graph/many_parallel_transformers_test.dart
@@ -11,6 +11,7 @@ import '../utils.dart';
 
 main() {
   initConfig();
+  currentSchedule.timeout = new Duration(seconds: 30);

[nweiz, 2013/12/06 19:24:44]

I like to scale the timeouts by doing "currentSchedule.timeout *= 3" or
something like that.

30s is likely too long here; keep in mind that this is the timeout between
asynchronous steps, rather than a global timeout for the test. I'd go with 15s
instead.

 
   test("handles many parallel transformers", () {
     var files = new List.generate(100, (i) => "app|$i.txt");