Add isPageVisible to Page

third_party/WebKit/Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 363 matching lines @@
     } else if (m_timerForCompressStrings.isActive()) {
         m_timerForCompressStrings.stop();
     }
 }
 
 PageVisibilityState Page::visibilityState() const
 {
     return m_visibilityState;
 }
 
+bool Page::isPageVisible() const
+{
+    return visibilityState() == PageVisibilityStateVisible;
+}
+
 bool Page::isCursorVisible() const
 {
     return m_isCursorVisible && settings().deviceSupportsMouse();
 }
 
 void Page::addMultisamplingChangedObserver(MultisamplingChangedObserver* observer)
 {
     m_multisamplingChangedObservers.add(observer);
 }
 
@@ skipping 208 matching lines @@
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 template class CORE_TEMPLATE_EXPORT WillBeHeapSupplement<Page>;
 
 } // namespace blink