Lower priority of async scripts

Source/core/fetch/FetchRequest.h

Index: Source/core/fetch/FetchRequest.h
diff --git a/Source/core/fetch/FetchRequest.h b/Source/core/fetch/FetchRequest.h
index 7117fc92e04adb0b012573071d77bb7cb843d685..5cb956c339d0756d99203ce60418c33001b69e2a 100644
--- a/Source/core/fetch/FetchRequest.h
+++ b/Source/core/fetch/FetchRequest.h
@@ -38,7 +38,7 @@ class SecurityOrigin;
 
 class FetchRequest {
 public:
-    enum DeferOption { NoDefer, DeferredByClient };
+    enum DeferOption { NoDefer, LazyLoad, DeferredByClient };
     enum OriginRestriction { UseDefaultOriginRestrictionForType, RestrictToSameOrigin, NoOriginRestriction };
 
     explicit FetchRequest(const ResourceRequest&, const AtomicString& initiator, const String& charset = String(), ResourceLoadPriority = ResourceLoadPriorityUnresolved);