Do not show image placeholders for CSS sprites

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

Index: third_party/WebKit/Source/core/css/CSSImageSetValue.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSImageSetValue.cpp b/third_party/WebKit/Source/core/css/CSSImageSetValue.cpp
index 55b987308ca1a4c725c5432138dcff214305ce82..006bf25fe0341a955d3e79b20561dd1f149b4264 100644
--- a/third_party/WebKit/Source/core/css/CSSImageSetValue.cpp
+++ b/third_party/WebKit/Source/core/css/CSSImageSetValue.cpp
@@ -30,6 +30,7 @@
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Settings.h"

[sclittle, 2017/06/21 20:46:56]

nit: Remove unused include

 #include "core/loader/resource/ImageResourceContent.h"
 #include "core/style/StyleFetchedImageSet.h"
 #include "core/style/StyleInvalidImage.h"
@@ -101,6 +102,7 @@ StyleImage* CSSImageSetValue::CachedImage(float device_scale_factor) const {
 StyleImage* CSSImageSetValue::CacheImage(
     const Document& document,
     float device_scale_factor,
+    FetchParameters::PlaceholderImageRequestType placeholder_image_request_type,
     CrossOriginAttributeValue cross_origin) {
   if (!images_in_set_.size())
     FillImageSet();
@@ -122,7 +124,8 @@ StyleImage* CSSImageSetValue::CacheImage(
       params.SetCrossOriginAccessControl(document.GetSecurityOrigin(),
                                          cross_origin);
     }
-    if (document.GetFrame())
+    if (document.GetFrame() &&
+        placeholder_image_request_type == FetchParameters::kAllowPlaceholder)
       document.GetFrame()->MaybeAllowImagePlaceholder(params);
 
     if (ImageResourceContent* cached_image =