Optional binary payloads in VM service events.

runtime/bin/vmservice/server.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 vmservice_io;
 
 class WebSocketClient extends Client {
   static const int PARSE_ERROR_CODE = 4000;
   static const int BINARY_MESSAGE_ERROR_CODE = 4001;
   static const int NOT_MAP_ERROR_CODE = 4002;
@@ skipping 19 matching lines @@
         socket.close(NOT_MAP_ERROR_CODE, 'Message must be a JSON map.');
         return;
       }
       var seq = map['seq'];
       onMessage(seq, new Message.fromUri(Uri.parse(map['request'])));
     } else {
       socket.close(BINARY_MESSAGE_ERROR_CODE, 'Message must be a string.');
     }
   }
 
-  void post(var seq, String response) {
+  void post(var seq, dynamic response) {
     try {
       Map map = {
         'seq': seq,
         'response': response
       };
-      socket.add(JSON.encode(map));
+      if (seq == null && response is! String) {
+        socket.add(response);
+      } else {
+        socket.add(JSON.encode(map));
+      }
     } catch (_) {
-      // Error posting over WebSocket.
+      print("Ignoring error posting over WebSocket.");
     }
   }
 
   dynamic toJson() {
     Map map = super.toJson();
     map['type'] = 'WebSocketClient';
     map['socket'] = '$socket';
     return map;
   }
 }
@@ skipping 134 matching lines @@
       _server = null;
       return this;
     }).catchError((e, st) {
       _server = null;
       print('Could not shutdown Observatory HTTP server:\n$e\n$st\n');
       return this;
     });
   }
 
 }