Add isolate event handler setup in order to be able to propagate isolate

vm/isolate.cc

 // Copyright (c) 2012, 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.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "lib/mirrors.h"
 #include "vm/compiler_stats.h"
@@ skipping 216 matching lines @@
   result->set_api_state(state);
 
   // Initialize stack top and limit in case we are running the isolate in the
   // main thread.
   // TODO(5411455): Need to figure out how to set the stack limit for the
   // main thread.
   result->SetStackLimitFromCurrentTOS(reinterpret_cast<uword>(&result));
   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) {
     if (name_prefix == NULL || strcmp(name_prefix, "vm-isolate") != 0) {
       OS::Print("[+] Starting isolate:\n"
                 "\tisolate:    %s\n", result->name());
     }
   }
   return result;
 }
@@ skipping 157 matching lines @@
 
   // Clean up debugger resources. Shutting down the debugger
   // requires a handle zone. We must set up a temporary zone because
   // Isolate::Shutdown is called without a zone.
   {
     Zone zone(this);
     HandleScope handle_scope(this);
     debugger_->Shutdown();
   }
 
+  // Signal isolate shutdown event.
+  Debugger::SignalIsolateEvent(Debugger::kIsolateShutdown);
+
   // Close all the ports owned by this isolate.
   PortMap::ClosePorts(message_handler());
 
   // Fail fast if anybody tries to post any more messsages to this isolate.
   delete message_handler();
   set_message_handler(NULL);
 
   // Finalize any weak persistent handles with a non-null referent.
   FinalizeWeakPersistentHandlesVisitor visitor;
   api_state()->weak_persistent_handles().VisitHandles(&visitor);
@@ skipping 67 matching lines @@
 
 
 void Isolate::VisitWeakPersistentHandles(HandleVisitor* visitor,
                                          bool visit_prologue_weak_handles) {
   if (api_state() != NULL) {
     api_state()->VisitWeakHandles(visitor, visit_prologue_weak_handles);
   }
 }
 
 }  // namespace dart