Oilpan: DOM wrappers don't need to keep persistent handles

Source/bindings/core/v8/WorkerScriptController.cpp

 /*
  * Copyright (C) 2009, 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 98 matching lines @@
     , m_workerGlobalScope(workerGlobalScope)
     , m_executionForbidden(false)
     , m_executionScheduledToTerminate(false)
     , m_globalScopeExecutionState(0)
 {
     m_isolate = V8PerIsolateData::initialize();
     V8Initializer::initializeWorker(m_isolate);
     m_world = DOMWrapperWorld::create(WorkerWorldId);
     m_interruptor = adoptPtr(new V8IsolateInterruptor(m_isolate));
     ThreadState::current()->addInterruptor(m_interruptor.get());
+    ThreadState::current()->registerTraceDOMWrappers(m_isolate, V8GCController::traceDOMWrappers);
 }
 
 // We need to postpone V8 Isolate destruction until the very end of
 // worker thread finalization when all objects on the worker heap
 // are destroyed.
 class IsolateCleanupTask : public ThreadState::CleanupTask {
 public:
     static PassOwnPtr<IsolateCleanupTask> create(v8::Isolate* isolate)
     {
         return adoptPtr(new IsolateCleanupTask(isolate));
@@ skipping 178 matching lines @@
 
 void WorkerScriptController::rethrowExceptionFromImportedScript(PassRefPtrWillBeRawPtr<ErrorEvent> errorEvent, ExceptionState& exceptionState)
 {
     const String& errorMessage = errorEvent->message();
     if (m_globalScopeExecutionState)
         m_globalScopeExecutionState->m_errorEventFromImportedScript = errorEvent;
     exceptionState.rethrowV8Exception(V8ThrowException::createGeneralError(errorMessage, m_isolate));
 }
 
 } // namespace blink