Print isolate properly in debug output for IsolateRunnable events.

runtime/vm/service.h

 // 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.
 
 #ifndef VM_SERVICE_H_
 #define VM_SERVICE_H_
 
 #include "include/dart_tools_api.h"
 
 #include "vm/allocation.h"
@@ skipping 166 matching lines @@
                         const char* event_type,
                         const Object& eventMessage);
 
   // Does not take ownership of 'data'.
   static void SendEventWithData(const char* stream_id,
                                 const char* event_type,
                                 const String& meta,
                                 const uint8_t* data,
                                 intptr_t size);
 
-  static void PostEvent(const char* stream_id,
+  static void PostEvent(Isolate* isolate,
+                        const char* stream_id,
                         const char* kind,
                         JSONStream* event);
 
   static EmbedderServiceHandler* isolate_service_handler_head_;
   static EmbedderServiceHandler* root_service_handler_head_;
   static Dart_ServiceStreamListenCallback stream_listen_callback_;
   static Dart_ServiceStreamCancelCallback stream_cancel_callback_;
   static Dart_GetVMServiceAssetsArchive get_service_assets_callback_;
 
   static bool needs_isolate_events_;
   static bool needs_debug_events_;
   static bool needs_gc_events_;
   static bool needs_echo_events_;
   static bool needs_graph_events_;
 };
 
 }  // namespace dart
 
 #endif  // VM_SERVICE_H_