WorkerGlobalScope: verify same-heap event listeners.

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 112 matching lines @@
 void WorkerGlobalScope::exceptionUnhandled(int exceptionId) {
   ErrorEvent* event = m_pendingErrorEvents.take(exceptionId);
   DCHECK(event);
   if (WorkerThreadDebugger* debugger =
           WorkerThreadDebugger::from(thread()->isolate()))
     debugger->exceptionThrown(m_thread, event);
 }
 
 void WorkerGlobalScope::registerEventListener(
     V8AbstractEventListener* eventListener) {
+  // TODO(sof): remove once crbug.com/677654 has been diagnosed.
+  CHECK(&ThreadState::fromObject(this)->heap() == &ThreadState::fromObject(eventListener)->heap());
   bool newEntry = m_eventListeners.add(eventListener).isNewEntry;
-  RELEASE_ASSERT(newEntry);
+  CHECK(newEntry);
 }
 
 void WorkerGlobalScope::deregisterEventListener(
     V8AbstractEventListener* eventListener) {
   auto it = m_eventListeners.find(eventListener);
-  RELEASE_ASSERT(it != m_eventListeners.end());
+  CHECK(it != m_eventListeners.end());
   m_eventListeners.remove(it);
 }
 
 WorkerLocation* WorkerGlobalScope::location() const {
   if (!m_location)
     m_location = WorkerLocation::create(m_url);
   return m_location.get();
 }
 
 WorkerNavigator* WorkerGlobalScope::navigator() const {
@@ skipping 223 matching lines @@
   visitor->trace(m_timers);
   visitor->trace(m_eventListeners);
   visitor->trace(m_pendingErrorEvents);
   ExecutionContext::trace(visitor);
   EventTargetWithInlineData::trace(visitor);
   SecurityContext::trace(visitor);
   Supplementable<WorkerGlobalScope>::trace(visitor);
 }
 
 }  // namespace blink