workers: Move core worker functionality into InProcessWorkerBase.

Source/core/workers/InProcessWorkerBase.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef InProcessWorkerBase_h
+#define InProcessWorkerBase_h
+
+#include "core/CoreExport.h"
+#include "core/dom/ActiveDOMObject.h"
+#include "core/dom/MessagePort.h"
+#include "core/events/EventListener.h"
+#include "core/events/EventTarget.h"
+#include "core/workers/AbstractWorker.h"
+#include "core/workers/WorkerScriptLoaderClient.h"
+#include "platform/heap/Handle.h"
+#include "wtf/Forward.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+#include "wtf/text/AtomicStringHash.h"
+
+namespace blink {
+
+class ExceptionState;
+class ExecutionContext;
+class WorkerGlobalScopeProxy;
+class WorkerScriptLoader;
+
+// Base class for workers that operate in the same process as the document that creates them.
+class CORE_EXPORT InProcessWorkerBase : public AbstractWorker, private WorkerScriptLoaderClient {
+public:
+    virtual ~InProcessWorkerBase();
+
+    void postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionState&);
+    void terminate();
+
+    // ActiveDOMObject
+    void stop() override;
+    bool hasPendingActivity() const override;
+
+    DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
+
+    DECLARE_VIRTUAL_TRACE();
+
+protected:
+    explicit InProcessWorkerBase(ExecutionContext*);
+    bool initialize(ExecutionContext*, const String&, ExceptionState&);
+
+    // Creates a proxy to allow communicating with the worker's global scope.

[kinuko, 2015/04/13 05:55:52]

Hmm, ok, sorry, may not be very informative as the method name implies it.  We
can remove this comment, or maybe add a bit more info like: the created proxy is
supposed to be self-owned and to be deleted upon terminateWorkerGlobalScope().

[sadrul, 2015/04/13 16:50:03]

Good point. Updated the comment to document the lifetime of the proxy.

+    virtual WorkerGlobalScopeProxy* createWorkerGlobalScopeProxy(ExecutionContext*) = 0;
+
+private:
+    // WorkerScriptLoaderClient callbacks
+    void didReceiveResponse(unsigned long identifier, const ResourceResponse&) override;
+    void notifyFinished() override;
+
+    RefPtr<WorkerScriptLoader> m_scriptLoader;
+    WorkerGlobalScopeProxy* m_contextProxy; // The proxy outlives the worker to perform thread shutdown.
+};
+
+} // namespace blink
+
+#endif // InProcessWorkerBase_h