Preload scan external CSS for @import

third_party/WebKit/Source/core/fetch/Resource.cpp

Index: third_party/WebKit/Source/core/fetch/Resource.cpp
diff --git a/third_party/WebKit/Source/core/fetch/Resource.cpp b/third_party/WebKit/Source/core/fetch/Resource.cpp
index 31065b424de1b0d4ae6081c43870045d0a58e1d1..a88e43c79f3cd47a0321c0f9c034fee86bcf72e2 100644
--- a/third_party/WebKit/Source/core/fetch/Resource.cpp
+++ b/third_party/WebKit/Source/core/fetch/Resource.cpp
@@ -661,9 +661,9 @@ static bool shouldSendCachedDataSynchronouslyForType(Resource::Type type)
     return false;
 }
 
-void Resource::willAddClientOrObserver()
+void Resource::willAddClientOrObserver(PreloadReferencePolicy policy)
 {
-    if (m_preloadResult == PreloadNotReferenced) {
+    if (policy == MarkAsReferenced && m_preloadResult == PreloadNotReferenced) {
         if (isLoaded())
             m_preloadResult = PreloadReferencedWhileComplete;
         else if (isLoading())
@@ -681,9 +681,9 @@ void Resource::willAddClientOrObserver()
         memoryCache()->makeLive(this);
 }
 
-void Resource::addClient(ResourceClient* client)
+void Resource::addClient(ResourceClient* client, PreloadReferencePolicy policy)
 {
-    willAddClientOrObserver();
+    willAddClientOrObserver(policy);
 
     if (m_isRevalidating) {
         m_clients.add(client);