[WIP2] off-main-thread loading

third_party/WebKit/Source/core/workers/WorkerGlobalScope.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009, 2011 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 257 matching lines @@
       console_message->Message(), console_message->Location());
   GetThread()->GetConsoleMessageStorage()->AddConsoleMessage(this,
                                                              console_message);
 }
 
 WorkerEventQueue* WorkerGlobalScope::GetEventQueue() const {
   return event_queue_.Get();
 }
 
 CoreProbeSink* WorkerGlobalScope::GetProbeSink() {
+  if (IsClosing())
+    return nullptr;
   if (WorkerInspectorController* controller =
           GetThread()->GetWorkerInspectorController())
     return controller->GetProbeSink();
   return nullptr;
 }
 
 bool WorkerGlobalScope::IsSecureContext(String& error_message) const {
   // Until there are APIs that are available in workers and that
   // require a privileged context test that checks ancestors, just do
   // a simple check here. Once we have a need for a real
@@ skipping 90 matching lines @@
   visitor->Trace(event_listeners_);
   visitor->Trace(pending_error_events_);
   visitor->Trace(fetch_context_);
   EventTargetWithInlineData::Trace(visitor);
   SecurityContext::Trace(visitor);
   WorkerOrWorkletGlobalScope::Trace(visitor);
   Supplementable<WorkerGlobalScope>::Trace(visitor);
 }
 
 }  // namespace blink