Do not show image placeholders for CSS sprites

third_party/WebKit/Source/core/css/CSSCrossfadeValue.cpp

 /*
  * Copyright (C) 2011 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
@@ skipping 47 matching lines @@
 
   return false;
 }
 
 static ImageResourceContent* CachedImageForCSSValue(CSSValue* value,
                                                     const Document& document) {
   if (!value)
     return nullptr;
 
   if (value->IsImageValue()) {
-    StyleImage* style_image_resource =
-        ToCSSImageValue(value)->CacheImage(document);
+    StyleImage* style_image_resource = ToCSSImageValue(value)->CacheImage(
+        document, FetchParameters::kAllowPlaceholder);
     if (!style_image_resource)
       return nullptr;
 
     return style_image_resource->CachedImage();
   }
 
   if (value->IsImageGeneratorValue()) {
     ToCSSImageGeneratorValue(value)->LoadSubimages(document);
     // FIXME: Handle CSSImageGeneratorValue (and thus cross-fades with gradients
     // and canvas).
@@ skipping 214 matching lines @@
   visitor->Trace(from_value_);
   visitor->Trace(to_value_);
   visitor->Trace(percentage_value_);
   visitor->Trace(cached_from_image_);
   visitor->Trace(cached_to_image_);
   visitor->Trace(crossfade_subimage_observer_);
   CSSImageGeneratorValue::TraceAfterDispatch(visitor);
 }
 
 }  // namespace blink