[WIP] off-main-thread loading

content/child/service_worker/service_worker_network_provider.cc

Index: content/child/service_worker/service_worker_network_provider.cc
diff --git a/content/child/service_worker/service_worker_network_provider.cc b/content/child/service_worker/service_worker_network_provider.cc
index f66d85c765e010b04c5e9134943f9c2afaec4cc9..fc7afa81c04a501c75b6637091fcbbde3d26c701 100644
--- a/content/child/service_worker/service_worker_network_provider.cc
+++ b/content/child/service_worker/service_worker_network_provider.cc
@@ -86,6 +86,8 @@ class WebServiceWorkerNetworkProviderForFrame
     return kInvalidServiceWorkerVersionId;
   }
 
+  int providerID() override { return provider_->provider_id(); }
+
   ServiceWorkerNetworkProvider* provider() { return provider_.get(); }
 
  private: