Service isolate requests Observatory assets from embedder

sdk/lib/vmservice/vmservice.dart

 // Copyright (c) 2015, 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 dart._vmservice;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:isolate';
 import 'dart:typed_data';
 
+part 'asset.dart';
 part 'client.dart';
 part 'constants.dart';
 part 'running_isolate.dart';
 part 'running_isolates.dart';
 part 'message.dart';
 part 'message_router.dart';
 
 final RawReceivePort isolateLifecyclePort = new RawReceivePort();
 final RawReceivePort scriptLoadPort = new RawReceivePort();
 
@@ skipping 300 matching lines @@
 }
 
 external void _onStart();
 
 external void _onExit();
 
 external bool _vmListenStream(String streamId);
 
 external void _vmCancelStream(String streamId);
 
+external Uint8List _requestAssets();