Revert of Revert "Post loading tasks on the appropriate WebFrameScheduler's queue."

third_party/WebKit/Source/core/fetch/FetchContext.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class KURL;
 class ResourceError;
 class ResourceLoader;
 class ResourceResponse;
 class ResourceRequest;
 class ResourceTimingInfo;
+class WebTaskRunner;
 
 enum FetchResourceType {
     FetchMainResource,
     FetchSubresource
 };
 
 class CORE_EXPORT FetchContext : public GarbageCollectedFinalized<FetchContext> {
     WTF_MAKE_NONCOPYABLE(FetchContext);
 public:
     static FetchContext& nullInstance();
@@ skipping 38 matching lines @@
     virtual bool updateTimingInfoForIFrameNavigation(ResourceTimingInfo*) { return false; }
     virtual void sendImagePing(const KURL&);
     virtual void addConsoleMessage(const String&) const;
     virtual SecurityOrigin* securityOrigin() const { return nullptr; }
     virtual void upgradeInsecureRequest(FetchRequest&);
     virtual void addClientHintsIfNecessary(FetchRequest&);
     virtual void addCSPHeaderIfNecessary(Resource::Type, FetchRequest&);
 
     virtual ResourceLoadPriority modifyPriorityForExperiments(ResourceLoadPriority priority, Resource::Type, const FetchRequest&, ResourcePriority::VisibilityStatus) { return priority; }
 
+    virtual WebTaskRunner* loadingTaskRunner() const { return nullptr; }
+
 protected:
     FetchContext() { }
 };
 
 }
 
 #endif