Fix loading placeholders for Lo-Fi

third_party/WebKit/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 504 matching lines @@
     }
 
     if (m_image->animationPolicy() != newPolicy) {
         m_image->resetAnimation();
         m_image->setAnimationPolicy(newPolicy);
     }
 }
 
 void ImageResource::reloadIfLoFi(ResourceFetcher* fetcher)
 {
-    if (!m_response.httpHeaderField("chrome-proxy").contains("q=low"))
+    if (m_resourceRequest.loFiState() != WebURLRequest::LoFiOn)
+        return;
+    if (isLoaded() && !m_response.httpHeaderField("chrome-proxy").contains("q=low"))
         return;
     m_resourceRequest.setCachePolicy(WebCachePolicy::BypassingCache);
     m_resourceRequest.setLoFiState(WebURLRequest::LoFiOff);
     if (isLoading())
         m_loader->cancel();
-    else
-        updateImageAndClearBuffer();
+    clear();
+    m_data.clear();
+    notifyObservers();
     setStatus(NotStarted);
     fetcher->startLoad(this);
 }
 
 void ImageResource::changedInRect(const blink::Image* image, const IntRect& rect)
 {
     if (!image || image != m_image)
         return;
     notifyObservers(&rect);
 }
@@ skipping 32 matching lines @@
     if (response().wasFetchedViaServiceWorker())
         return response().serviceWorkerResponseType() != WebServiceWorkerResponseTypeOpaque;
     if (!getImage()->currentFrameHasSingleSecurityOrigin())
         return false;
     if (passesAccessControlCheck(securityOrigin))
         return true;
     return !securityOrigin->taintsCanvas(response().url());
 }
 
 } // namespace blink