Fix mjsunit/debug-script.js failure that occurs when running with the --isolates flag.

src/d8.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1571 matching lines @@
     {
       Isolate::Scope iscope(isolate);
       Locker lock(isolate);
       HandleScope scope;
       Persistent<Context> context = Shell::CreateEvaluationContext();
       {
         Context::Scope cscope(context);
         Execute();
       }
       context.Dispose();
+      if (Shell::options.send_idle_notification) {
+        const int kLongIdlePauseInMs = 1000;
+        V8::ContextDisposedNotification();
+        V8::IdleNotification(kLongIdlePauseInMs);
+      }
     }
     if (done_semaphore_ != NULL) done_semaphore_->Signal();
   } while (!Shell::options.last_run);
   isolate->Dispose();
 }
 
 
 void SourceGroup::StartExecuteInThread() {
   if (thread_ == NULL) {
     thread_ = new IsolateThread(this);
@@ skipping 292 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif