Do not show image placeholders for CSS sprites

third_party/WebKit/Source/core/loader/DocumentLoader.cpp

Index: third_party/WebKit/Source/core/loader/DocumentLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
index 21220f9880a848be2d0b7627d78d93ce5b71dfa8..0d93cffd68a0cc62563a3bdb4309e7e8755bbb67 100644
--- a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
@@ -191,8 +191,10 @@ Resource* DocumentLoader::StartPreload(Resource::Type type,
   Resource* resource = nullptr;
   switch (type) {
     case Resource::kImage:
-      if (frame_)
+      if (frame_ && frame_->GetSettings() &&
+          frame_->GetSettings()->GetFetchImagePlaceholders()) {

[sclittle, 2017/06/13 00:28:27]

Could you remove the Settings checks here? They're already handled by
frame_->MaybeAllowImagePlaceholder.

[rajendrant, 2017/06/21 19:00:58]

Done.

         frame_->MaybeAllowImagePlaceholder(params);
+      }
       resource = ImageResource::Fetch(params, Fetcher());
       break;
     case Resource::kScript: