[Blink] Display images in the center of the screen

third_party/WebKit/Source/core/html/ImageDocument.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 #ifndef ImageDocument_h
 #define ImageDocument_h
 
+#include "core/html/HTMLDivElement.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/HTMLImageElement.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class ImageResource;
 
 class CORE_EXPORT ImageDocument final : public HTMLDocument {
  public:
@@ skipping 20 matching lines @@
 
   // These methods are for m_shrinkToFitMode == Desktop.
   void resizeImageToFit();
   void restoreImageSize();
   bool imageFitsInWindow() const;
   bool shouldShrinkToFit() const;
   // Calculates the image size multiplier that's needed to fit the image to
   // the window, taking into account page zoom and device scale.
   float scale() const;
 
+  Member<HTMLDivElement> m_divElement;
   Member<HTMLImageElement> m_imageElement;
 
   // Whether enough of the image has been loaded to determine its size
   bool m_imageSizeIsKnown;
 
   // Whether the image is shrunk to fit or not
   bool m_didShrinkImage;
 
   // Whether the image should be shrunk or not
   bool m_shouldShrinkImage;
 
   enum ShrinkToFitMode { Viewport, Desktop };
   ShrinkToFitMode m_shrinkToFitMode;
 };
 
 DEFINE_DOCUMENT_TYPE_CASTS(ImageDocument);
 
 }  // namespace blink
 
 #endif  // ImageDocument_h