Use Shadow DOM to display fallback content for images

Source/core/fetch/ImageResource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007 Apple 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
@@ skipping 140 matching lines @@
 }
 
 void ImageResource::allClientsRemoved()
 {
     m_pendingContainerSizeRequests.clear();
     if (m_image && !errorOccurred())
         m_image->resetAnimation();
     Resource::allClientsRemoved();
 }
 
-pair<blink::Image*, float> ImageResource::brokenImage(float deviceScaleFactor)
-{
-    if (deviceScaleFactor >= 2) {
-        DEFINE_STATIC_REF(blink::Image, brokenImageHiRes, (blink::Image::loadPlatformResource("missingImage@2x")));
-        return std::make_pair(brokenImageHiRes, 2);
-    }
-
-    DEFINE_STATIC_REF(blink::Image, brokenImageLoRes, (blink::Image::loadPlatformResource("missingImage")));
-    return std::make_pair(brokenImageLoRes, 1);
-}
-
-bool ImageResource::willPaintBrokenImage() const
-{
-    return errorOccurred();
-}
 
 blink::Image* ImageResource::image()
 {
     ASSERT(!isPurgeable());
 
-    if (errorOccurred()) {
-        // Returning the 1x broken image is non-ideal, but we cannot reliably access the appropriate
-        // deviceScaleFactor from here. It is critical that callers use ImageResource::brokenImage()
-        // when they need the real, deviceScaleFactor-appropriate broken image icon.
-        return brokenImage(1).first;
-    }
-
     if (m_image)
         return m_image.get();
 
     return blink::Image::nullImage();
 }
 
 blink::Image* ImageResource::imageForRenderer(const RenderObject* renderer)
 {
     ASSERT(!isPurgeable());
 
-    if (errorOccurred()) {
-        // Returning the 1x broken image is non-ideal, but we cannot reliably access the appropriate
-        // deviceScaleFactor from here. It is critical that callers use ImageResource::brokenImage()
-        // when they need the real, deviceScaleFactor-appropriate broken image icon.
-        return brokenImage(1).first;
-    }
-
     if (!m_image)
         return blink::Image::nullImage();
 
     if (m_image->isSVGImage()) {
         blink::Image* image = m_svgImageCache->imageForRenderer(renderer);
         if (image != blink::Image::nullImage())
             return image;
     }
 
     return m_image.get();
@@ skipping 275 matching lines @@
     if (response().wasFetchedViaServiceWorker())
         return response().serviceWorkerResponseType() != WebServiceWorkerResponseTypeOpaque;
     if (!image()->currentFrameHasSingleSecurityOrigin())
         return false;
     if (passesAccessControlCheck(securityOrigin))
         return true;
     return !securityOrigin->taintsCanvas(response().url());
 }
 
 } // namespace blink