Remove DocumentVisibilityObserver

sky/engine/core/html/HTMLCanvasElement.h

 /*
  * Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 49 matching lines @@
 class CanvasObserver {
     DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(CanvasObserver);
 public:
     virtual void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect) = 0;
     virtual void canvasResized(HTMLCanvasElement*) = 0;
 #if !ENABLE(OILPAN)
     virtual void canvasDestroyed(HTMLCanvasElement*) = 0;
 #endif
 };
 
-class HTMLCanvasElement final : public HTMLElement, public DocumentVisibilityObserver, public CanvasImageSource, public ImageBufferClient {
+class HTMLCanvasElement final : public HTMLElement, public CanvasImageSource, public ImageBufferClient {
     DEFINE_WRAPPERTYPEINFO();
 public:
     DECLARE_NODE_FACTORY(HTMLCanvasElement);
     virtual ~HTMLCanvasElement();
 
     void addObserver(CanvasObserver*);
     void removeObserver(CanvasObserver*);
 
     // Attributes and functions exposed to script
     int width() const { return size().width(); }
@@ skipping 47 matching lines @@
     bool is3D() const;
 
     bool hasImageBuffer() const { return m_imageBuffer; }
     bool hasValidImageBuffer() const;
     void discardImageBuffer();
 
     bool shouldAccelerate(const IntSize&) const;
 
     virtual const AtomicString imageSourceURL() const override;
 
-    // DocumentVisibilityObserver implementation
-    virtual void didChangeVisibilityState(PageVisibilityState) override;
-
     // CanvasImageSource implementation
     virtual PassRefPtr<Image> getSourceImageForCanvas(SourceImageMode, SourceImageStatus*) const override;
     virtual FloatSize sourceSize() const override;
 
     // ImageBufferClient implementation
     virtual void notifySurfaceInvalid() override;
     virtual bool isDirty() override { return !m_dirtyRect.isEmpty(); }
     virtual void didFinalizeFrame() override;
 
-protected:
-    virtual void didMoveToNewDocument(Document& oldDocument) override;
-
 private:
     explicit HTMLCanvasElement(Document&);
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
     virtual RenderObject* createRenderer(RenderStyle*) override;
 
     void finalizeFrameMicrotask();
 
     void reset();
 
@@ skipping 32 matching lines @@
     OwnPtr<ImageBuffer> m_imageBuffer;
     mutable OwnPtr<GraphicsContextStateSaver> m_contextStateSaver;
 
     mutable RefPtr<Image> m_presentedImage;
     mutable RefPtr<Image> m_copiedImage; // FIXME: This is temporary for platforms that have to copy the image buffer to render (and for CSSCanvasValue).
 };
 
 } // namespace blink
 
 #endif // HTMLCanvasElement_h