Introduce ThreadableLoadingContext: make threaded loading code one step away from Document

third_party/WebKit/Source/core/loader/WorkerThreadableLoader.h

 /*
  * Copyright (C) 2009 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 29 matching lines @@
 #include "public/platform/WebTraceLocation.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Threading.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 #include <memory>
 
 namespace blink {
 
+class ThreadableLoadingContext;
 class ResourceError;
 class ResourceRequest;
 class ResourceResponse;
 class WorkerGlobalScope;
 class WorkerLoaderProxy;
 struct CrossThreadResourceRequestData;
 struct CrossThreadResourceTimingInfoData;
 
 // A WorkerThreadableLoader is a ThreadableLoader implementation intended to
 // be used in a WebWorker thread. Because Blink's ResourceFetcher and
@@ skipping 105 matching lines @@
     void didFailAccessControlCheck(const ResourceError&) override;
     void didFailRedirectCheck() override;
     void didReceiveResourceTiming(const ResourceTimingInfo&) override;
 
     void contextDestroyed(WorkerThreadLifecycleContext*) override;
 
     DECLARE_TRACE();
 
    private:
     MainThreadLoaderHolder(TaskForwarder*, WorkerThreadLifecycleContext*);
-    void start(Document&,
+    void start(ThreadableLoadingContext&,
                std::unique_ptr<CrossThreadResourceRequestData>,
                const ThreadableLoaderOptions&,
                const ResourceLoaderOptions&);
 
     Member<TaskForwarder> m_forwarder;
     Member<ThreadableLoader> m_mainThreadLoader;
 
     // |*m_workerLoader| lives in the worker thread.
     CrossThreadWeakPersistent<WorkerThreadableLoader> m_workerLoader;
   };
@@ skipping 29 matching lines @@
   ResourceLoaderOptions m_resourceLoaderOptions;
   BlockingBehavior m_blockingBehavior;
 
   // |*m_mainThreadLoaderHolder| lives in the main thread.
   CrossThreadPersistent<MainThreadLoaderHolder> m_mainThreadLoaderHolder;
 };
 
 }  // namespace blink
 
 #endif  // WorkerThreadableLoader_h