Ensure JavaScript equality when serviceWorker.register resolves to an existing worker [1/3]

Source/modules/serviceworkers/ServiceWorker.cpp

 /*
  * Copyright (C) 2013 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 140 matching lines @@
         return existingServiceWorker;
     }
 
     return create(executionContext, adoptPtr(worker));
 }
 
 PassRefPtrWillBeRawPtr<ServiceWorker> ServiceWorker::from(ScriptPromiseResolver* resolver, WebType* worker)
 {
     RefPtrWillBeRawPtr<ServiceWorker> serviceWorker = ServiceWorker::from(resolver->scriptState()->executionContext(), worker);
     ScriptState::Scope scope(resolver->scriptState());
-    serviceWorker->waitOnPromise(resolver->promise());
+    if (serviceWorker->m_proxyState == Initial)
+        serviceWorker->waitOnPromise(resolver->promise());
     return serviceWorker;
 }
 
 void ServiceWorker::setProxyState(ProxyState state)
 {
     if (m_proxyState == state)
         return;
     switch (m_proxyState) {
     case Initial:
         ASSERT(state == RegisterPromisePending || state == ContextStopped);
@@ skipping 60 matching lines @@
     , WebServiceWorkerProxy(this)
     , m_outerWorker(worker)
     , m_proxyState(Initial)
 {
     ScriptWrappable::init(this);
     ASSERT(m_outerWorker);
     m_outerWorker->setProxy(this);
 }
 
 } // namespace blink