Add HTMLPictureElement-based source selection to HTMLImageElement

Source/core/html/HTMLImageElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * 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.
@@ skipping 15 matching lines @@
 
 #include "core/html/HTMLElement.h"
 #include "core/html/HTMLImageLoader.h"
 #include "core/html/canvas/CanvasImageSource.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "wtf/WeakPtr.h"
 
 namespace WebCore {
 
 class HTMLFormElement;
+class ImageCandidate;
 
 class HTMLImageElement FINAL : public HTMLElement, public CanvasImageSource {
 public:
     static PassRefPtrWillBeRawPtr<HTMLImageElement> create(Document&);
     static PassRefPtrWillBeRawPtr<HTMLImageElement> create(Document&, HTMLFormElement*);
     static PassRefPtrWillBeRawPtr<HTMLImageElement> createForJSConstructor(Document&, int width, int height);
 
     virtual ~HTMLImageElement();
 
     int width(bool ignorePendingStylesheets = false);
@@ skipping 70 matching lines @@
     virtual bool draggable() const OVERRIDE;
 
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void removedFrom(ContainerNode*) OVERRIDE;
     virtual bool shouldRegisterAsNamedItem() const OVERRIDE { return true; }
     virtual bool shouldRegisterAsExtraNamedItem() const OVERRIDE { return true; }
     virtual bool isInteractiveContent() const OVERRIDE;
     virtual Image* imageContents() OVERRIDE;
 
     void resetFormOwner();
+    ImageCandidate findBestFitImageFromPictureParent();
+    void setBestFitURLAndDPRFromImageCandidate(const ImageCandidate&);
 
     HTMLImageLoader m_imageLoader;
     // m_form should be a strong reference in Oilpan.
     WeakPtr<HTMLFormElement> m_form;
     CompositeOperator m_compositeOperator;
     AtomicString m_bestFitImageURL;
     float m_imageDevicePixelRatio;
     bool m_formWasSetByParser;
 };
 
 } //namespace
 
 #endif