Treat responses with LoFi headers as being LoFi images.

third_party/WebKit/Source/core/loader/resource/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 441 matching lines @@
     case PlaceholderOption::ReloadPlaceholderOnDecodeError:
       return getStatus() == ResourceStatus::DecodeError;
     case PlaceholderOption::DoNotReloadPlaceholder:
       return false;
   }
   NOTREACHED();
   return false;
 }
 
 static bool isLoFiImage(const ImageResource& resource) {
-  if (!(resource.resourceRequest().previewsState() &
-        WebURLRequest::ServerLoFiOn)) {
-    return false;
+  if (resource.isLoaded()) {
+    return resource.response()
+        .httpHeaderField("chrome-proxy-content-transform")
+        .contains("empty-image");
   }
-  return !resource.isLoaded() ||
-         resource.response()
-             .httpHeaderField("chrome-proxy-content-transform")
-             .contains("empty-image");
+  return resource.resourceRequest().previewsState() &
+         WebURLRequest::ServerLoFiOn;
 }
 
 void ImageResource::reloadIfLoFiOrPlaceholderImage(
     ResourceFetcher* fetcher,
     ReloadLoFiOrPlaceholderPolicy policy) {
   if (policy == kReloadIfNeeded && !shouldReloadBrokenPlaceholder())
     return;
 
   if (m_placeholderOption == PlaceholderOption::DoNotReloadPlaceholder &&
       !isLoFiImage(*this))
@@ skipping 112 matching lines @@
     //    reloading in Step 3 due to notifyObservers()'s
     //    schedulingReloadOrShouldReloadBrokenPlaceholder() check.
     // 3. reloadIfLoFiOrPlaceholderImage() is called via ResourceFetcher
     //    (a) via didFinishLoading() called in decodeError(), or
     //    (b) after returning ImageResource::updateImage().
     decodeError(allDataReceived);
   }
 }
 
 }  // namespace blink