Remove DocumentVisibilityObserver

sky/engine/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 128 matching lines @@
 enum DocumentClass {
     DefaultDocumentClass = 0,
     HTMLDocumentClass = 1,
     MediaDocumentClass = 1 << 4,
 };
 
 typedef unsigned char DocumentClassFlags;
 
 class Document;
 
-class DocumentVisibilityObserver {
-public:
-    DocumentVisibilityObserver(Document&);
-    virtual ~DocumentVisibilityObserver();
-
-    virtual void didChangeVisibilityState(PageVisibilityState) = 0;
-
-    // Classes that inherit Node and DocumentVisibilityObserver must have a
-    // virtual override of Node::didMoveToNewDocument that calls
-    // DocumentVisibilityObserver::setDocument
-    void setObservedDocument(Document&);
-
-private:
-    void registerObserver(Document&);
-    void unregisterObserver();
-
-    RawPtr<Document> m_document;
-};
-
 class Document : public ContainerNode, public TreeScope, public ExecutionContext, public ExecutionContextClient
     , public DocumentSupplementable, public LifecycleContext<Document>, public ResourceClient {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtr<Document> create(const DocumentInit& initializer = DocumentInit())
     {
         return adoptRef(new Document(initializer));
     }
     virtual ~Document();
 
@@ skipping 432 matching lines @@
         HttpRefreshFromMetaTag
     };
     void maybeHandleHttpRefresh(const String&, HttpRefreshType);
 
     PassOwnPtr<LifecycleNotifier<Document> > createLifecycleNotifier();
 
     void setHasViewportUnits() { m_hasViewportUnits = true; }
     bool hasViewportUnits() const { return m_hasViewportUnits; }
     void notifyResizeForViewportUnits();
 
-    void registerVisibilityObserver(DocumentVisibilityObserver*);
-    void unregisterVisibilityObserver(DocumentVisibilityObserver*);
-
     void didRecalculateStyleForElement() { ++m_styleRecalcElementCounter; }
 
     virtual v8::Handle<v8::Object> wrap(v8::Handle<v8::Object> creationContext, v8::Isolate*) override;
 
 protected:
     Document(const DocumentInit&, DocumentClassFlags = DefaultDocumentClass);
 
 #if !ENABLE(OILPAN)
     virtual void dispose() override;
 #endif
@@ skipping 191 matching lines @@
     CompositorPendingAnimations m_compositorPendingAnimations;
 
     RefPtr<Document> m_templateDocument;
     // With Oilpan the templateDocument and the templateDocumentHost
     // live and die together. Without Oilpan, the templateDocumentHost
     // is a manually managed backpointer from m_templateDocument.
     RawPtr<Document> m_templateDocumentHost;
 
     bool m_hasViewportUnits;
 
-    typedef HashSet<RawPtr<DocumentVisibilityObserver> > DocumentVisibilityObserverSet;
-    DocumentVisibilityObserverSet m_visibilityObservers;
-
     int m_styleRecalcElementCounter;
     mutable DocumentLoadTiming m_documentLoadTiming;
 };
 
 inline void Document::scheduleRenderTreeUpdateIfNeeded()
 {
     // Inline early out to avoid the function calls below.
     if (hasPendingStyleRecalc())
         return;
     if (shouldScheduleRenderTreeUpdate() && needsRenderTreeUpdate())
@@ skipping 20 matching lines @@
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h