Presentation API: implement .getAvalability() (Blink side).

Source/modules/presentation/AvailableChangeEvent.cpp

-// 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.
-
-#include "config.h"
-#include "modules/presentation/AvailableChangeEvent.h"
-
-namespace blink {
-
-AvailableChangeEvent::~AvailableChangeEvent()
-{
-}
-
-AvailableChangeEvent::AvailableChangeEvent()
-    : m_available(false)
-{
-}
-
-AvailableChangeEvent::AvailableChangeEvent(const AtomicString& eventType, bool available)
-    : Event(eventType, false, false)
-    , m_available(available)
-{
-}
-
-AvailableChangeEvent::AvailableChangeEvent(const AtomicString& eventType, const AvailableChangeEventInit& initializer)
-    : Event(eventType, initializer)
-    , m_available(initializer.available())
-{
-}
-
-const AtomicString& AvailableChangeEvent::interfaceName() const
-{
-    return EventNames::AvailableChangeEvent;
-}
-
-} // namespace blink