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 f5738ceabe409c6e66942afd4be0d70c579096e9..717379a9649c2e132a0e641490df155b21be077d 100644
--- a/third_party/WebKit/Source/core/css/CSSImageSetValue.h
+++ b/third_party/WebKit/Source/core/css/CSSImageSetValue.h
@@ -43,10 +43,10 @@ class CSSImageSetValue : public CSSValueList {
 
   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);
 
   String customCSSText() const;