Add zone support to streams.

tests/lib/async/catch_errors25_test.dart

Index: tests/lib/async/catch_errors25_test.dart
diff --git a/tests/lib/async/catch_errors4_test.dart b/tests/lib/async/catch_errors25_test.dart
similarity index 63%
copy from tests/lib/async/catch_errors4_test.dart
copy to tests/lib/async/catch_errors25_test.dart
index d14f948911d101cfd7d8fb00e6ebcffc87981909..706a1843c14050fa1453e974ff6ff0dd6a83d7b1 100644
--- a/tests/lib/async/catch_errors4_test.dart
+++ b/tests/lib/async/catch_errors25_test.dart
@@ -11,21 +11,19 @@ main() {
   // time out if the callbacks are not invoked.
   var port = new ReceivePort();
   var events = [];
-  // Test that synchronous errors inside a `catchErrors` are caught.
+  StreamController controller;
+  // Test multiple subscribers of an asBroadcastStream inside the same
+  // `catchErrors`.
   catchErrors(() {
-    events.add("catch error entry");
-    throw "catch error";
-  }).listen((x) {
-      events.add(x);
-    },
-    onDone: () {
+    var stream = new Stream.fromIterable([1, 2]).asBroadcastStream();
+    stream.listen(events.add);
+    stream.listen(events.add);
+  }).listen((x) { events.add("outer: $x"); },
+            onDone: () {
       Expect.listEquals([
-                         "catch error entry",
-                         "main exit",
-                         "catch error",
+                         1, 1, 2, 2,
                          ],
                          events);
       port.close();
     });
-  events.add("main exit");
 }