add sendRequest to VMIsolateRef

lib/src/scope.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.
 
 import 'dart:async';
 
 import 'package:json_rpc_2/json_rpc_2.dart' as rpc;
 
 import 'error.dart';
 import 'exceptions.dart';
@@ skipping 28 matching lines @@
     if (result["type"] == "Sentinel") {
       throw new VMSentinelException(newVMSentinel(result));
     }
 
     return result;
   }
 
   /// Calls an isolate-scoped RPC named [method] with [params].
   ///
   /// This always adds the `isolateId` parameter to the RPC.
-  Future<Map> sendRequest(String method, [Map<String, Object> params]) async {
+  Future<Object> sendRequest(String method, [Map<String, Object> params]) async {
     var allParams = {"isolateId": isolateId}..addAll(params ?? {});
-    return (await peer.sendRequest(method, allParams)) as Map;
+    return await peer.sendRequest(method, allParams);
   }
 
   /// Evaluates [expression] in the context of the object identified by [id].
   ///
   /// Throws a [VMErrorException] if evaluating the expression throws an error.
   /// Throws a [VMSentinelException] if the object has expired.
   Future<VMInstanceRef> evaluate(String id, String expression) async {
     var result = await sendRequest("evaluate", {
       "targetId": id,
       "expression": expression
@@ skipping 66 matching lines @@
 
     var result = await immediate();
     if (result != null && result != false) {
       subscription.cancel();
       return result;
     }
 
     return await completer.future;
   }
 }