Optional binary payloads in VM service events.

runtime/bin/vmservice/observatory/lib/service_io.dart

 // Copyright (c) 2014, 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.
 
 library service_io;
 
+import 'dart:async';
 import 'dart:io';
+import 'dart:typed_data';
 
 import 'package:observatory/service_common.dart';
 
 // Export the service library.
 export 'package:observatory/service_common.dart';
 
 class _IOWebSocket implements CommonWebSocket {
   WebSocket _webSocket;
   
   void connect(String address,
@@ skipping 15 matching lines @@
   bool get isOpen =>
       (_webSocket != null) && (_webSocket.readyState == WebSocket.OPEN);
   
   void send(dynamic data) {
     _webSocket.add(data);
   }
   
   void close() {
     _webSocket.close();
   }
+  
+  Future<ByteData> nonStringToByteData(dynamic data) {
+    assert(data is Uint8List);
+    print('nonString: ${data.lengthInBytes}, $data');
+    return new Future.sync(() =>
+        new ByteData.view(data.buffer,
+                          data.offsetInBytes,
+                          data.lengthInBytes));
+  }
 }
 
 /// The [WebSocketVM] communicates with a Dart VM over WebSocket. The Dart VM
 /// can be embedded in Chromium or standalone. In the case of Chromium, we
 /// make the service requests via the Chrome Remote Debugging Protocol.
 class WebSocketVM extends CommonWebSocketVM {
   WebSocketVM(WebSocketVMTarget target) : super(target, new _IOWebSocket());
 }