third_party/WebKit/Source/core/timing/DOMWindowPerformance.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 "core/timing/DOMWindowPerformance.h"

#include "core/frame/LocalDOMWindow.h"
#include "core/frame/LocalFrame.h"
#include "core/timing/Performance.h"

namespace blink {

DOMWindowPerformance::DOMWindowPerformance(LocalDOMWindow& window)
    : DOMWindowProperty(window.frame())
    , m_window(&window)
{
}

DEFINE_TRACE(DOMWindowPerformance)
{
    visitor->trace(m_window);
    visitor->trace(m_performance);
    Supplement<LocalDOMWindow>::trace(visitor);
    DOMWindowProperty::trace(visitor);
}

// static
const char* DOMWindowPerformance::supplementName()
{
    return "DOMWindowPerformance";
}

// static
DOMWindowPerformance& DOMWindowPerformance::from(LocalDOMWindow& window)
{
    DOMWindowPerformance* supplement = static_cast<DOMWindowPerformance*>(Supplement<LocalDOMWindow>::from(window, supplementName()));
    if (!supplement) {
        supplement = new DOMWindowPerformance(window);
        provideTo(window, supplementName(), supplement);
    }
    return *supplement;
}

// static
Performance* DOMWindowPerformance::performance(DOMWindow& window)
{
    return from(toLocalDOMWindow(window)).performance();
}

Performance* DOMWindowPerformance::performance()
{
    if (!m_performance)
        m_performance = Performance::create(m_window->frame());
    return m_performance.get();
}

} // namespace blink