Update VM service to new isolate API

runtime/vm/isolate.h

Index: runtime/vm/isolate.h
diff --git a/runtime/vm/isolate.h b/runtime/vm/isolate.h
index 128f7e22cafa3853a9ec070fc7c0843e1df44b35..195fdf8793c86aa025235dc0a7671b37c6d32d18 100644
--- a/runtime/vm/isolate.h
+++ b/runtime/vm/isolate.h
@@ -130,6 +130,12 @@ class Isolate : public BaseIsolate {
     main_port_ = port;
   }
 
+  Dart_Port service_port() { return service_port_; }
+  void set_service_port(Dart_Port port) {
+    ASSERT(service_port_ == 0);  // Only set service port once.
+    service_port_ = port;
+  }
+
   Heap* heap() const { return heap_; }
   void set_heap(Heap* value) { heap_ = value; }
   static intptr_t heap_offset() { return OFFSET_OF(Isolate, heap_); }
@@ -388,6 +394,7 @@ class Isolate : public BaseIsolate {
   char* name_;
   int64_t start_time_;
   Dart_Port main_port_;
+  Dart_Port service_port_;
   Heap* heap_;
   ObjectStore* object_store_;
   RawContext* top_context_;