Identify service worker version at main resource load time.

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 7246c3172930316fec18735c359171f0d6bc8859..2bab590d49c54378d837125154266164183547b8 100644
--- a/content/child/service_worker/service_worker_network_provider.cc
+++ b/content/child/service_worker/service_worker_network_provider.cc
@@ -49,4 +49,13 @@ ServiceWorkerNetworkProvider::~ServiceWorkerNetworkProvider() {
       new ServiceWorkerHostMsg_ProviderDestroyed(provider_id_));
 }
 
+void ServiceWorkerNetworkProvider::SetServiceWorkerVersionId(
+    int64 version_id) {
+  if (!ChildThread::current())
+    return;  // May be null in some tests.
+  ChildThread::current()->Send(
+      new ServiceWorkerHostMsg_SetVersionId(provider_id_, version_id));
+  // todo: add new message type and handler in backend
+}
+
 }  // namespace content