Redo StreamTransformers so they work with Stack traces.

pkg/barback/test/stream_pool_test.dart

Index: pkg/barback/test/stream_pool_test.dart
diff --git a/pkg/barback/test/stream_pool_test.dart b/pkg/barback/test/stream_pool_test.dart
index d7013292cb42551de8a5467f5c47c6bfab2dfba5..2054a4cef29e1a425702947618bf805a198a436a 100644
--- a/pkg/barback/test/stream_pool_test.dart
+++ b/pkg/barback/test/stream_pool_test.dart
@@ -50,9 +50,9 @@ main() {
       controller1.add("fifth");
 
       expect(newFuture(() {
-        return pool.stream.transform(new StreamTransformer(
+        return pool.stream.transform(new StreamTransformer.fromHandlers(
             handleData: (data, sink) => sink.add(["data", data]),
-            handleError: (error, sink) => sink.add(["error", error]))).toList();
+            handleError: (e, st, sink) => sink.add(["error", e]))).toList();

[nweiz, 2013/10/07 20:29:20]

Please use a full word rather than "st". Also below.

[Bob Nystrom, 2013/10/07 20:29:54]

e -> error
st -> stackTrace

Here and below.

[floitsch, 2013/10/10 15:39:57]

Done.

[floitsch, 2013/10/10 15:39:57]

Done.

       }), completion(equals([
         ["data", "first"],
         ["data", "second"],
@@ -111,9 +111,9 @@ main() {
       controller2.addError("second");
 
       expect(newFuture(() {
-        return pool.stream.transform(new StreamTransformer(
+        return pool.stream.transform(new StreamTransformer.fromHandlers(
             handleData: (data, sink) => sink.add(data),
-            handleError: (error, sink) => sink.add(error))).toList();
+            handleError: (error, st, sink) => sink.add(error))).toList();
       }), completion(isEmpty));
 
       pumpEventQueue().then((_) => pool.close());