Start to implement FetchEvent for ServiceWorker

Source/modules/serviceworkers/FetchEvent.cpp

+// Copyright 2014 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.
+
+#include "config.h"
+#include "FetchEvent.h"
+
+#include "core/events/ThreadLocalEventNames.h"
+#include "modules/serviceworkers/ServiceWorkerGlobalScope.h"
+#include "wtf/RefPtr.h"
+
+namespace WebCore {
+
+PassRefPtr<FetchEvent> FetchEvent::create()
+{
+    return adoptRef(new FetchEvent());
+}
+
+PassRefPtr<FetchEvent> FetchEvent::create(PassRefPtr<RespondWithObserver> observer)
+{
+    return adoptRef(new FetchEvent(observer));
+}
+
+void FetchEvent::respondWith(const ScriptValue& value)
+{
+    m_observer->respondWith(value);
+}
+
+const AtomicString& FetchEvent::interfaceName() const
+{
+    return EventNames::FetchEvent;
+}
+
+FetchEvent::FetchEvent()
+{
+    ScriptWrappable::init(this);
+}
+
+FetchEvent::FetchEvent(PassRefPtr<RespondWithObserver> observer)
+    : Event(EventTypeNames::fetch, /*canBubble=*/false, /*cancelable=*/true)
+    , m_observer(observer)
+{
+    ScriptWrappable::init(this);
+}
+
+} // namespace WebCore