Ensure that stack traces are propagated more often in dart:io.

sdk/lib/io/http_impl.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.io;
 
 const int _OUTGOING_BUFFER_SIZE = 8 * 1024;
 
 class _HttpIncoming extends Stream<List<int>> {
   final int _transferLength;
@@ skipping 1037 matching lines @@
       var future = writeHeaders();
       if (future != null) {
         // While incoming is being drained, the pauseFuture is non-null. Pause
         // output until it's drained.
         sub.pause(future);
       }
     }
     return socket.addStream(controller.stream)
         .then((_) {
           return outbound;
-        }, onError: (error) {
+        }, onError: (error, stackTrace) {
           // Be sure to close it in case of an error.
           if (_gzip) _gzipSink.close();
           _socketError = true;
-          _doneCompleter.completeError(error);
+          _doneCompleter.completeError(error, stackTrace);
           if (_ignoreError(error)) {
             return outbound;
           } else {
             throw error;
           }
         });
   }
 
   Future close() {
     // If we are already closed, return that future.
@@ skipping 53 matching lines @@
       }
       // Clear references, for better GC.
       _buffer = null;
       // And finally flush it. As we support keep-alive, never close it from
       // here. Once the socket is flushed, we'll be able to reuse it (signaled
       // by the 'done' future).
       return socket.flush()
         .then((_) {
           _doneCompleter.complete(socket);
           return outbound;
-        }, onError: (error) {
-          _doneCompleter.completeError(error);
+        }, onError: (error, stackTrace) {
+          _doneCompleter.completeError(error, stackTrace);
           if (_ignoreError(error)) {
             return outbound;
           } else {
             throw error;
           }
         });
     }
 
     var future = writeHeaders();
     if (future != null) {
@@ skipping 1091 matching lines @@
                                          {Function onError,
                                          void onDone(),
                                          bool cancelOnError}) {
     _serverSocket.listen(
         (Socket socket) {
           socket.setOption(SocketOption.TCP_NODELAY, true);
           // Accept the client connection.
           _HttpConnection connection = new _HttpConnection(socket, this);
           _idleConnections.add(connection);
         },
-        onError: (error) {
+        onError: (error, stackTrace) {
           // Ignore HandshakeExceptions as they are bound to a single request,
           // and are not fatal for the server.
           if (error is! HandshakeException) {
-            _controller.addError(error);
+            _controller.addError(error, stackTrace);
           }
         },
         onDone: _controller.close);
     return _controller.stream.listen(onData,
                                      onError: onError,
                                      onDone: onDone,
                                      cancelOnError: cancelOnError);
   }
 
   Future close({bool force: false}) {
@@ skipping 44 matching lines @@
   }
 
   void _handleRequest(_HttpRequest request) {
     if (!closed) {
       _controller.add(request);
     } else {
       request._httpConnection.destroy();
     }
   }
 
-  void _handleError(error) {
-    if (!closed) _controller.addError(error);
-  }
-
   void _connectionClosed(_HttpConnection connection) {
     // Remove itself from either idle or active connections.
     connection.unlink();
     _maybePerformCleanup();
   }
 
   void _markIdle(_HttpConnection connection) {
     _activeConnections.remove(connection);
     _idleConnections.add(connection);
   }
@@ skipping 484 matching lines @@
   const _RedirectInfo(this.statusCode, this.method, this.location);
 }
 
 String _getHttpVersion() {
   var version = Platform.version;
   // Only include major and minor version numbers.
   int index = version.indexOf('.', version.indexOf('.') + 1);
   version = version.substring(0, index);
   return 'Dart/$version (dart:io)';
 }