Refactor the API for setting dynamic resource load priorities

Source/core/fetch/FetchContext.h

Index: Source/core/fetch/FetchContext.h
diff --git a/Source/core/fetch/FetchContext.h b/Source/core/fetch/FetchContext.h
index dbcb39b1809f5f6cfc60a6c4ea8137d58f618c39..054b465dfae220746c9b9b8be9950a086ef7cc26 100644
--- a/Source/core/fetch/FetchContext.h
+++ b/Source/core/fetch/FetchContext.h
@@ -104,8 +104,7 @@ public:
     virtual void addClientHintsIfNecessary(FetchRequest&);
     virtual void addCSPHeaderIfNecessary(Resource::Type, FetchRequest&);
 
-    virtual bool fetchIncreasePriorities() const { return false; }
-    virtual ResourceLoadPriority modifyPriorityForExperiments(ResourceLoadPriority priority, Resource::Type, const FetchRequest&) { return priority; }
+    virtual ResourceLoadPriority modifyPriorityForExperiments(ResourceLoadPriority priority, Resource::Type, const FetchRequest&, ResourcePriority::VisibilityStatus) { return priority; }
 
 protected:
     FetchContext() { }