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

Source/core/workers/Worker.cpp

Index: Source/core/workers/Worker.cpp
diff --git a/Source/core/workers/Worker.cpp b/Source/core/workers/Worker.cpp
index ecd92b8c72e6de8a877ebdadb624cb6a9bb5b87d..d4607c6566cdcdc9cea078400cbec3dddb4fbd34 100644
--- a/Source/core/workers/Worker.cpp
+++ b/Source/core/workers/Worker.cpp
@@ -58,21 +58,10 @@ PassRefPtrWillBeRawPtr<Worker> Worker::create(ExecutionContext* context, const S
         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()
@@ -98,6 +87,24 @@ void Worker::postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> me
     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)