Do not show image placeholders for CSS sprites

third_party/WebKit/Source/core/css/CSSImageSetValue.h

 /*
  * Copyright (C) 2012 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 25 matching lines @@
 class Document;
 class StyleImage;
 
 class CSSImageSetValue : public CSSValueList {
  public:
   static CSSImageSetValue* create() { return new CSSImageSetValue(); }
   ~CSSImageSetValue();
 
   bool isCachePending(float deviceScaleFactor) const;
   StyleImage* cachedImage(float deviceScaleFactor) const;
-  StyleImage* cacheImage(
-      const Document&,
-      float deviceScaleFactor,
-      CrossOriginAttributeValue = CrossOriginAttributeNotSet);
+  StyleImage* cacheImage(const Document&,
+                         float deviceScaleFactor,
+                         CrossOriginAttributeValue = CrossOriginAttributeNotSet,
+                         bool allowImagePlaceholder = false);

[kouhei (in TOK), 2017/04/11 07:45:59]

Can we take ImagePlaceHolderRequestType?
 
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/platform/loade...

[Raj, 2017/04/20 19:01:17]

Done.

 
   String customCSSText() const;
 
   struct ImageWithScale {
     DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
     String imageURL;
     Referrer referrer;
     float scaleFactor;
   };
 
@@ skipping 19 matching lines @@
   Member<StyleImage> m_cachedImage;
 
   Vector<ImageWithScale> m_imagesInSet;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSImageSetValue, isImageSetValue());
 
 }  // namespace blink
 
 #endif  // CSSImageSetValue_h