Implement the infrastructure of creating WorkerFetchContext in worker global scope.

third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h

Index: third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h
diff --git a/third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h b/third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h
index 4b8c565edbc49ab90c28183cf91ca6a8bc4c2700..35b021cf75e39995e480f71aa3cf708b90733e38 100644
--- a/third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h
+++ b/third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h
@@ -51,6 +51,7 @@ class WebServiceWorkerNetworkProvider;
 class WebServiceWorkerProvider;
 class WebServiceWorkerResponse;
 class WebString;
+class WebWorkerFetchContext;
 
 // This interface is implemented by the client. It is supposed to be created
 // on the main thread and then passed on to the worker thread by a newly
@@ -232,6 +233,10 @@ class WebServiceWorkerContextClient {
     return nullptr;
   }
 
+  virtual blink::WebWorkerFetchContext* CreateServiceWorkerFetchContext() {

[kinuko, 2017/04/18 08:35:37]

nit: please add a method comment here too

[horo, 2017/04/18 12:53:35]

Done.

+    return nullptr;
+  }
+
   // Ownership of the returned object is transferred to the caller.
   // This is called on the main thread.
   virtual WebServiceWorkerProvider* CreateServiceWorkerProvider() {