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 56714095d10e2511f46391547347091d1683cdaa..cd5be25909072947d3234a950fb1da93e97b82fb 100644
--- a/third_party/WebKit/Source/core/fetch/Resource.cpp
+++ b/third_party/WebKit/Source/core/fetch/Resource.cpp
@@ -673,10 +673,10 @@ static bool shouldSendCachedDataSynchronouslyForType(Resource::Type type)
     return false;
 }
 
-void Resource::willAddClientOrObserver()
+void Resource::willAddClientOrObserver(PreloadReferencePolicy policy)
 {
     ASSERT(!isPurgeable());
-    if (m_preloadResult == PreloadNotReferenced) {
+    if (policy == MarkAsReferenced && m_preloadResult == PreloadNotReferenced) {
         if (isLoaded())
             m_preloadResult = PreloadReferencedWhileComplete;
         else if (isLoading())
@@ -694,9 +694,9 @@ 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);