Introduce WorkerThread::willShutdown()

Source/core/workers/WorkerThread.cpp

 /*
  * Copyright (C) 2008 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 259 matching lines @@
     {
         MutexLocker lock(m_threadStateMutex);
         if (m_shutdown)
             return;
         m_shutdown = true;
     }
 
     // This should be called before we start the shutdown procedure.
     workerReportingProxy().willDestroyWorkerGlobalScope();
 
+    willShutdown();
     workerGlobalScope()->dispose();
 
     backingThread().removeTaskObserver(m_microtaskRunner.get());
     postTask(FROM_HERE, createSameThreadTask(&WorkerThread::performShutdownTask, this));
 }
 
 void WorkerThread::performShutdownTask()
 {
     // The below assignment will destroy the context, which will in turn notify messaging proxy.
     // We cannot let any objects survive past thread exit, because no other thread will run GC or otherwise destroy them.
@@ skipping 159 matching lines @@
     v8::Isolate* isolate = V8PerIsolateData::initialize();
     V8Initializer::initializeWorker(isolate);
 
     OwnPtr<V8IsolateInterruptor> interruptor = adoptPtr(new V8IsolateInterruptor(isolate));
     ThreadState::current()->addInterruptor(interruptor.release());
     ThreadState::current()->registerTraceDOMWrappers(isolate, V8GCController::traceDOMWrappers);
 
     return isolate;
 }
 
+void WorkerThread::willShutdown()
+{
+    ASSERT(isCurrentThread());
+    ASSERT(m_isolate);
+    ASSERT(m_workerGlobalScope->script());
+}
+
 void WorkerThread::willDestroyIsolate()
 {
     ASSERT(isCurrentThread());
     ASSERT(m_isolate);
     V8PerIsolateData::willBeDestroyed(m_isolate);
 }
 
 void WorkerThread::destroyIsolate()
 {
     ASSERT(isCurrentThread());
@@ skipping 48 matching lines @@
     InspectorInstrumentation::didLeaveNestedRunLoop(m_workerGlobalScope.get());
 }
 
 void WorkerThread::setWorkerInspectorController(WorkerInspectorController* workerInspectorController)
 {
     MutexLocker locker(m_workerInspectorControllerMutex);
     m_workerInspectorController = workerInspectorController;
 }
 
 } // namespace blink