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

third_party/WebKit/Source/web/WebSharedWorkerImpl.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 119 matching lines @@
 
   void connectTaskOnWorkerThread(WebMessagePortChannelUniquePtr);
 
   // WorkerLoaderProxyProvider
   // postTaskToLoader() must be called from a worker thread.
   void postTaskToLoader(const WebTraceLocation&,
                         std::unique_ptr<WTF::CrossThreadClosure>) override;
   void postTaskToWorkerGlobalScope(
       const WebTraceLocation&,
       std::unique_ptr<WTF::CrossThreadClosure>) override;
-  ExecutionContext* getLoaderExecutionContext() override;
+  ThreadableLoadingContext* getThreadableLoadingContext() override;
 
   // 'shadow page' - created to proxy loading requests from the worker.
   // Will be accessed by worker thread when posting tasks.
   Persistent<ExecutionContext> m_loadingDocument;
+  Persistent<ThreadableLoadingContext> m_loadingContext;
   WebView* m_webView;
   Persistent<WebLocalFrameImpl> m_mainFrame;
   bool m_askedToTerminate;
 
   std::unique_ptr<WebServiceWorkerNetworkProvider> m_networkProvider;
 
   Persistent<WorkerInspectorProxy> m_workerInspectorProxy;
 
   // Owned by the main thread, but will be accessed by the worker.
   CrossThreadPersistent<ParentFrameTaskRunners> m_parentFrameTaskRunners;
@@ skipping 12 matching lines @@
   RefPtr<WorkerLoaderProxy> m_loaderProxy;
 
   WebURL m_url;
   WebString m_name;
   WebAddressSpace m_creationAddressSpace;
 };
 
 }  // namespace blink
 
 #endif  // WebSharedWorkerImpl_h