Don't drop messages/events send to a service worker that is stopping.

content/browser/service_worker/embedded_worker_instance.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/service_worker/embedded_worker_instance.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind_helpers.h"
@@ skipping 273 matching lines @@
   DCHECK(status_ == STARTING);
   status_ = RUNNING;
   FOR_EACH_OBSERVER(Listener, listener_list_, OnStarted());
 }
 
 void EmbeddedWorkerInstance::OnStopped() {
   if (worker_devtools_agent_route_id_ != MSG_ROUTING_NONE)
     NotifyWorkerDestroyed(process_id_, worker_devtools_agent_route_id_);
   if (context_)
     context_->process_manager()->ReleaseWorkerProcess(embedded_worker_id_);
+  Status old_status = status_;
   status_ = STOPPED;
   process_id_ = -1;
   thread_id_ = -1;
   worker_devtools_agent_route_id_ = MSG_ROUTING_NONE;
   start_callback_.Reset();
-  FOR_EACH_OBSERVER(Listener, listener_list_, OnStopped());
+  FOR_EACH_OBSERVER(Listener, listener_list_, OnStopped(old_status));
 }
 
 void EmbeddedWorkerInstance::OnPausedAfterDownload() {
   // Stop can be requested before getting this far.
   if (status_ == STOPPING)
     return;
   DCHECK(status_ == STARTING);
   FOR_EACH_OBSERVER(Listener, listener_list_, OnPausedAfterDownload());
 }
 
@@ skipping 37 matching lines @@
 
 void EmbeddedWorkerInstance::AddListener(Listener* listener) {
   listener_list_.AddObserver(listener);
 }
 
 void EmbeddedWorkerInstance::RemoveListener(Listener* listener) {
   listener_list_.RemoveObserver(listener);
 }
 
 }  // namespace content