1. Create a port when a debugger object is created for an isolate, use this

vm/isolate.cc

Index: vm/isolate.cc
===================================================================
--- vm/isolate.cc	(revision 13186)
+++ vm/isolate.cc	(working copy)
@@ -48,7 +48,7 @@
   void CheckAccess();
 #endif
   bool IsCurrentIsolate() const;
-  Isolate* GetIsolate() const { return isolate_; }
+  virtual Isolate* GetIsolate() const { return isolate_; }
 
  private:
   Isolate* isolate_;
@@ -236,9 +236,6 @@
   result->set_main_port(PortMap::CreatePort(result->message_handler()));
   result->BuildName(name_prefix);
 
-  // Signal isolate creation event.
-  Debugger::SignalIsolateEvent(Debugger::kIsolateCreated);
-
   result->debugger_ = new Debugger();
   result->debugger_->Initialize(result);
   if (FLAG_trace_isolates) {
@@ -416,9 +413,6 @@
     debugger_->Shutdown();
   }
 
-  // Signal isolate shutdown event.
-  Debugger::SignalIsolateEvent(Debugger::kIsolateShutdown);
-
   // Close all the ports owned by this isolate.
   PortMap::ClosePorts(message_handler());