Network service: Implement URLLoader chaining for interceptors

content/browser/service_worker/service_worker_controllee_request_handler.h

Index: content/browser/service_worker/service_worker_controllee_request_handler.h
diff --git a/content/browser/service_worker/service_worker_controllee_request_handler.h b/content/browser/service_worker/service_worker_controllee_request_handler.h
index 329edcfd3fa3eed1822abd2e9a7de6112e2671ad..24a06a0800be611fa31ba287952b14b77ffd71d8 100644
--- a/content/browser/service_worker/service_worker_controllee_request_handler.h
+++ b/content/browser/service_worker/service_worker_controllee_request_handler.h
@@ -53,11 +53,25 @@ class CONTENT_EXPORT ServiceWorkerControlleeRequestHandler
   ~ServiceWorkerControlleeRequestHandler() override;
 
   // Called via custom URLRequestJobFactory.
+  // Returning a nullptr indicates that the request is not handled by
+  // this handler.
+  // This could get called multiple times during the lifetime.
   net::URLRequestJob* MaybeCreateJob(
       net::URLRequest* request,
       net::NetworkDelegate* network_delegate,
       ResourceContext* resource_context) override;
 
+  // Used only for PlzNavigate and --enable-network-service cases.
+  // This will replace MaybeCreateJob() once NetworkService is enabled.
+  // This could get called multiple times during the lifetime in redirect
+  // cases. (In fallback-to-network cases we basically forward the request
+  // to the request to the next request handler)
+  // URLLoaderRequestHandler overrides:
+  void MaybeCreateLoaderFactory(
+      const ResourceRequest& request,
+      ResourceContext* resource_context,
+      base::OnceCallback<void(mojom::URLLoaderFactory*)> callback) override;
+
  private:
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerControlleeRequestHandlerTest,
                            ActivateWaitingVersion);