Add isPageVisible to Page

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 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,
@@ skipping 169 matching lines @@
     float pageScaleFactor() const;
 
     float deviceScaleFactor() const { return m_deviceScaleFactor; }
     void setDeviceScaleFactor(float);
     void setDeviceColorProfile(const Vector<char>&);
     void resetDeviceColorProfileForTesting();
 
     static void allVisitedStateChanged(bool invalidateVisitedLinkHashes);
     static void visitedStateChanged(LinkHash visitedHash);
 
+    void setVisibilityState(PageVisibilityState, bool);
     PageVisibilityState visibilityState() const;
-    void setVisibilityState(PageVisibilityState, bool);
+    bool isPageVisible() const;
 
     bool isCursorVisible() const;
     void setIsCursorVisible(bool isVisible) { m_isCursorVisible = isVisible; }
 
 #if ENABLE(ASSERT)
     void setIsPainting(bool painting) { m_isPainting = painting; }
     bool isPainting() const { return m_isPainting; }
 #endif
 
     class CORE_EXPORT MultisamplingChangedObserver : public WillBeGarbageCollectedMixin {
@@ skipping 91 matching lines @@
     OwnPtrWillBeMember<MemoryPurgeController> m_memoryPurgeController;
 
     Timer<Page> m_timerForCompressStrings;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT WillBeHeapSupplement<Page>;
 
 } // namespace blink
 
 #endif // Page_h