Push API: define push event on Service Worker.

Source/modules/push_messaging/PushEvent.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 "modules/push_messaging/PushEvent.h"
+
+namespace WebCore {
+
+PushEventInit::PushEventInit()
+{
+}
+
+PushEvent::PushEvent()
+{
+    ScriptWrappable::init(this);
+}
+
+PushEvent::PushEvent(const AtomicString& type, const String& data)
+    : Event(type, /*canBubble=*/false, /*cancelable=*/false)
+    , m_data(data)
+{
+    ScriptWrappable::init(this);
+}
+
+PushEvent::PushEvent(const AtomicString& type, const PushEventInit& initializer)
+    : Event(type, initializer)
+    , m_data(initializer.data)
+{
+    ScriptWrappable::init(this);
+}
+
+PushEvent::~PushEvent()
+{
+}
+
+const AtomicString& PushEvent::interfaceName() const
+{
+    return EventNames::PushEvent;
+}
+
+} // namespace WebCore