Fix pause-on-start and pause-on-exit with async loading.

runtime/vm/isolate.cc

 // 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.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
 #include "lib/mirrors.h"
@@ skipping 428 matching lines @@
   ASSERT(state != NULL);
   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);
-  result->message_handler()->set_pause_on_start(FLAG_pause_isolates_on_start);
-  result->message_handler()->set_pause_on_exit(FLAG_pause_isolates_on_exit);
 
   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());
     }
   }
 
@@ skipping 79 matching lines @@
   // a StackResource, which requires a current isolate.
   mutex_->Lock();
   // Check if we are in a valid state to make the isolate runnable.
   if (is_runnable_ == true) {
     mutex_->Unlock();
     return false;  // Already runnable.
   }
   // Set the isolate as runnable and if we are being spawned schedule
   // isolate on thread pool for execution.
   is_runnable_ = true;
+  if (!Service::IsServiceIsolate(this)) {
+    message_handler()->set_pause_on_start(FLAG_pause_isolates_on_start);
+    message_handler()->set_pause_on_exit(FLAG_pause_isolates_on_exit);
+  }
   IsolateSpawnState* state = spawn_state();
   if (state != NULL) {
     ASSERT(this == state->isolate());
     Run();
   }
   mutex_->Unlock();
   return true;
 }
 
 
@@ skipping 635 matching lines @@
   return func.raw();
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(isolate());
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart