Implement the infrastructure of creating WorkerFetchContext in worker global scope.

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 85 matching lines @@
   void PauseWorkerContextOnStart() override;
   void AttachDevTools(const WebString& host_id, int session_id) override;
   void ReattachDevTools(const WebString& host_id,
                         int sesion_id,
                         const WebString& saved_state) override;
   void DetachDevTools() override;
   void DispatchDevToolsMessage(int session_id,
                                int call_id,
                                const WebString& method,
                                const WebString& message) override;
+  WebServiceWorkerNetworkProvider* GetServiceWorkerNetworkProvider() override;
 
   // Callback methods for WebSharedWorkerReportingProxyImpl.
   void CountFeature(UseCounter::Feature);
   void PostMessageToPageInspector(const String& message);
   void DidCloseWorkerGlobalScope();
   void DidTerminateWorkerThread();
 
  private:
   ~WebSharedWorkerImpl() override;
 
@@ skipping 49 matching lines @@
   RefPtr<WorkerLoaderProxy> loader_proxy_;
 
   WebURL url_;
   WebString name_;
   WebAddressSpace creation_address_space_;
 };
 
 }  // namespace blink
 
 #endif  // WebSharedWorkerImpl_h