[WIP] Keep matched preloads for a while

third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp

Index: third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
diff --git a/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp b/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
index 5b3016ed4dee6f4f740229658cc5aeba0768713c..35b0fb0047da4bbf59941a93b7127fe46ef16e85 100644
--- a/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
+++ b/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
@@ -883,6 +883,7 @@ Resource* ResourceFetcher::MatchPreload(const FetchParameters& params,
 
   resource->DecreasePreloadCount();
   preloads_.erase(it);
+  matched_preloads_.push_back(resource);
   return resource;
 }
 
@@ -1215,6 +1216,8 @@ void ResourceFetcher::ClearPreloads(ClearPreloadsPolicy policy) {
     }
   }
   preloads_.RemoveAll(keys_to_be_removed);
+
+  matched_preloads_.clear();
 }
 
 void ResourceFetcher::WarnUnusedPreloads() {
@@ -1641,6 +1644,7 @@ DEFINE_TRACE(ResourceFetcher) {
   visitor->Trace(non_blocking_loaders_);
   visitor->Trace(document_resources_);
   visitor->Trace(preloads_);
+  visitor->Trace(matched_preloads_);
   visitor->Trace(resource_timing_info_map_);
 }