Add getIsolateID to Service class in dart:developer

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 RUNTIME_VM_SERVICE_H_
 #define RUNTIME_VM_SERVICE_H_
 
 #include "include/dart_tools_api.h"
 
 #include "vm/allocation.h"
@@ skipping 23 matching lines @@
  public:
   ServiceIdZone();
   virtual ~ServiceIdZone();
 
   // Returned string will be zone allocated.
   virtual char* GetServiceId(const Object& obj) = 0;
 
  private:
 };
 
+#define ISOLATE_SERVICE_ID_FORMAT_STRING "isolates/%" Pd64 ""
 
 class RingServiceIdZone : public ServiceIdZone {
  public:
   RingServiceIdZone();
   virtual ~RingServiceIdZone();
 
   void Init(ObjectIdRing* ring, ObjectIdRing::IdPolicy policy);
 
   // Returned string will be zone allocated.
   virtual char* GetServiceId(const Object& obj);
@@ skipping 159 matching lines @@
   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  // RUNTIME_VM_SERVICE_H_