Implement the infrastructure of creating WorkerFetchContext in worker global scope.

third_party/WebKit/public/web/WebSharedWorkerClient.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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebSharedWorkerClient_h
 #define WebSharedWorkerClient_h
 
 #include "public/platform/WebMessagePortChannel.h"
+#include "public/platform/WebWorkerFetchContext.h"
 #include "public/web/WebDevToolsAgentClient.h"
 
 namespace blink {
 
 class WebApplicationCacheHost;
 class WebApplicationCacheHostClient;
 class WebNotificationPresenter;
 class WebSecurityOrigin;
 class WebServiceWorkerNetworkProvider;
 class WebString;
@@ skipping 41 matching lines @@
   }
 
   virtual void SendDevToolsMessage(int session_id,
                                    int call_id,
                                    const WebString& message,
                                    const WebString& state) {}
   virtual WebDevToolsAgentClient::WebKitClientMessageLoop*
   CreateDevToolsMessageLoop() {
     return nullptr;
   }
+
+  // Returns a new WebWorkerFetchContext for the shared worker. Ownership of the
+  // returned object is transferred to the caller. This is used only when
+  // off-main-thread-fetch is enabled.
+  virtual std::unique_ptr<WebWorkerFetchContext> CreateWorkerFetchContext(
+      WebServiceWorkerNetworkProvider*) {
+    return nullptr;
+  }
 };
 
 }  // namespace blink
 
 #endif