Propagate stack trace when using Future.wait.

sdk/lib/async/future.dart

Index: sdk/lib/async/future.dart
diff --git a/sdk/lib/async/future.dart b/sdk/lib/async/future.dart
index 3e27a58ec407d40a7b3ae91b76341f42d5c22535..b039a74547ce4c80f756367a1512413c8d920bd7 100644
--- a/sdk/lib/async/future.dart
+++ b/sdk/lib/async/future.dart
@@ -218,10 +218,10 @@ abstract class Future<T> {
     // Set to null if an error occurs.
     List values;
 
-    dynamic handleError(error) {
+    dynamic handleError(error, stackTrace) {
       if (values != null) {
         values = null;
-        completer.completeError(error);
+        completer.completeError(error, stackTrace);
       }
       return null;
     }