Do not show image placeholders for CSS sprites

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

Index: third_party/WebKit/Source/core/css/CSSImageSetValue.h
diff --git a/third_party/WebKit/Source/core/css/CSSImageSetValue.h b/third_party/WebKit/Source/core/css/CSSImageSetValue.h
index 5954a337a01b517cd22a9dd08964dd8e7d1fe692..ca36a580c2584b83d60fecbd23e4bdac34666b1e 100644
--- a/third_party/WebKit/Source/core/css/CSSImageSetValue.h
+++ b/third_party/WebKit/Source/core/css/CSSImageSetValue.h
@@ -28,6 +28,7 @@
 
 #include "core/css/CSSValueList.h"
 #include "platform/CrossOriginAttributeValue.h"
+#include "platform/loader/fetch/FetchParameters.h"
 #include "platform/weborigin/Referrer.h"
 #include "platform/wtf/Allocator.h"
 
@@ -46,7 +47,9 @@ class CSSImageSetValue : public CSSValueList {
   StyleImage* CacheImage(
       const Document&,
       float device_scale_factor,
-      CrossOriginAttributeValue = kCrossOriginAttributeNotSet);
+      CrossOriginAttributeValue = kCrossOriginAttributeNotSet,
+      FetchParameters::PlaceholderImageRequestType =
+          FetchParameters::kDisallowPlaceholder);
 
   String CustomCSSText() const;