Redo StreamTransformers so they work with Stack traces.

sdk/lib/convert/converter.dart

Index: sdk/lib/convert/converter.dart
diff --git a/sdk/lib/convert/converter.dart b/sdk/lib/convert/converter.dart
index 2bda6fe2062978e17e118e1791bd1b18cad60498..0556761211492ebc4c93d0253bfa4ae94a40cbec 100644
--- a/sdk/lib/convert/converter.dart
+++ b/sdk/lib/convert/converter.dart
@@ -38,7 +38,9 @@ abstract class Converter<S, T> implements StreamTransformer {
 
   // Subclasses are encouraged to provide better types.
   Stream bind(Stream source) {
-    return new _ConverterTransformStream(source, this);
+    return new Stream.eventTransformed(
+        source,
+        (EventSink sink) => new _ConverterStreamEventSink(this, sink));
   }
 }