[NOT READY FOR REVIEW YET]workers: Some refactoring to allow creating new kind of worker threads

Source/core/workers/Worker.cpp

 /*
  * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009 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 40 matching lines @@
 
 PassRefPtrWillBeRawPtr<Worker> Worker::create(ExecutionContext* context, const String& url, ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     Document* document = toDocument(context);
     UseCounter::count(context, UseCounter::WorkerStart);
     if (!document->page()) {
         exceptionState.throwDOMException(InvalidAccessError, "The context provided is invalid.");
         return nullptr;
     }
-    WorkerGlobalScopeProxyProvider* proxyProvider = WorkerGlobalScopeProxyProvider::from(*document->page());
-    ASSERT(proxyProvider);
-
     RefPtrWillBeRawPtr<Worker> worker = adoptRefWillBeNoop(new Worker(context));
-
-    worker->suspendIfNeeded();
-
-    KURL scriptURL = worker->resolveURL(url, exceptionState);
-    if (scriptURL.isEmpty())
-        return nullptr;
-
-    worker->m_scriptLoader = WorkerScriptLoader::create();
-    worker->m_scriptLoader->loadAsynchronously(*context, scriptURL, DenyCrossOriginRequests, worker.get());
-    worker->m_contextProxy = proxyProvider->createWorkerGlobalScopeProxy(worker.get());
-    return worker.release();
+    if (worker->initialize(context, url, exceptionState))
+        return worker.release();
+    return nullptr;
 }
 
 Worker::~Worker()
 {
     ASSERT(isMainThread());
     if (!m_contextProxy)
         return;
     m_contextProxy->workerObjectDestroyed();
 }
 
 const AtomicString& Worker::interfaceName() const
 {
     return EventTargetNames::Worker;
 }
 
 void Worker::postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionState& exceptionState)
 {
     ASSERT(m_contextProxy);
     // Disentangle the port in preparation for sending it to the remote context.
     OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(ports, exceptionState);
     if (exceptionState.hadException())
         return;
     m_contextProxy->postMessageToWorkerGlobalScope(message, channels.release());
 }
 
+bool Worker::initialize(ExecutionContext* context, const String& url, ExceptionState& exceptionState)
+{
+    suspendIfNeeded();
+
+    Document* document = toDocument(context);
+    WorkerGlobalScopeProxyProvider* proxyProvider = WorkerGlobalScopeProxyProvider::from(*document->page());
+    ASSERT(proxyProvider);
+
+    KURL scriptURL = resolveURL(url, exceptionState);
+    if (scriptURL.isEmpty())
+        return false;
+
+    m_scriptLoader = WorkerScriptLoader::create();
+    m_scriptLoader->loadAsynchronously(*context, scriptURL, DenyCrossOriginRequests, this);
+    m_contextProxy = proxyProvider->createWorkerGlobalScopeProxy(this);
+    return true;
+}
+
 void Worker::terminate()
 {
     if (m_contextProxy)
         m_contextProxy->terminateWorkerGlobalScope();
 }
 
 void Worker::stop()
 {
     terminate();
 }
@@ skipping 23 matching lines @@
     }
     m_scriptLoader = nullptr;
 }
 
 void Worker::trace(Visitor* visitor)
 {
     AbstractWorker::trace(visitor);
 }
 
 } // namespace blink