third_party/WebKit/Source/core/timing/DOMWindowPerformance.cpp

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "config.h"
   6 #include "core/timing/DOMWindowPerformance.h"
   7
   8 #include "core/frame/LocalDOMWindow.h"
   9 #include "core/frame/LocalFrame.h"
  10 #include "core/timing/Performance.h"
  11
  12 namespace blink {
  13
  14 DOMWindowPerformance::DOMWindowPerformance(LocalDOMWindow& window)
  15     : DOMWindowProperty(window.frame())
  16     , m_window(&window)
  17 {
  18 }
  19
  20 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(DOMWindowPerformance);
  21
  22 DEFINE_TRACE(DOMWindowPerformance)
  23 {
  24     visitor->trace(m_window);
  25     visitor->trace(m_performance);
  26     WillBeHeapSupplement<LocalDOMWindow>::trace(visitor);
  27     DOMWindowProperty::trace(visitor);
  28 }
  29
  30 // static
  31 const char* DOMWindowPerformance::supplementName()
  32 {
  33     return "DOMWindowPerformance";
  34 }
  35
  36 // static
  37 DOMWindowPerformance& DOMWindowPerformance::from(LocalDOMWindow& window)
  38 {
  39     DOMWindowPerformance* supplement = static_cast<DOMWindowPerformance*>(WillBeHeapSupplement<LocalDOMWindow>::from(window, supplementName()));
  40     if (!supplement) {
  41         supplement = new DOMWindowPerformance(window);
  42         provideTo(window, supplementName(), adoptPtrWillBeNoop(supplement));
  43     }
  44     return *supplement;
  45 }
  46
  47 // static
  48 Performance* DOMWindowPerformance::performance(DOMWindow& window)
  49 {
  50     return from(toLocalDOMWindow(window)).performance();
  51 }
  52
  53 Performance* DOMWindowPerformance::performance()
  54 {
  55     if (!m_performance)
  56         m_performance = Performance::create(m_window->frame());
  57     return m_performance.get();
  58 }
  59
  60 } // namespace blink