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

R=yangguo@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10825454

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12347 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/d8.cc

@@ -1589,6 +1589,11 @@ void SourceGroup::ExecuteInThread() {
         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);