Add isPageVisible to Page

third_party/WebKit/Source/core/frame/DeviceSingleWindowEventController.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 "core/frame/DeviceSingleWindowEventController.h"
 
 #include "core/dom/Document.h"
 #include "core/events/Event.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/page/Page.h"
@@ skipping 31 matching lines @@
         else
             m_needsCheckingNullEvents = false;
     }
 }
 
 void DeviceSingleWindowEventController::didAddEventListener(LocalDOMWindow* window, const AtomicString& eventType)
 {
     if (eventType != eventTypeName())
         return;
 
-    if (page() && page()->visibilityState() == PageVisibilityStateVisible)
+    if (page() && page()->isPageVisible())
         startUpdating();
 
     m_hasEventListener = true;
 }
 
 void DeviceSingleWindowEventController::didRemoveEventListener(LocalDOMWindow* window, const AtomicString& eventType)
 {
     if (eventType != eventTypeName() || window->hasEventListeners(eventTypeName()))
         return;
 
     stopUpdating();
     m_hasEventListener = false;
 }
 
 void DeviceSingleWindowEventController::didRemoveAllEventListeners(LocalDOMWindow*)
 {
     stopUpdating();
     m_hasEventListener = false;
 }
 
 DEFINE_TRACE(DeviceSingleWindowEventController)
 {
     visitor->trace(m_document);
     PlatformEventController::trace(visitor);
     DOMWindowLifecycleObserver::trace(visitor);
 }
 
 } // namespace blink