Identify service worker version at main resource load time.

content/child/service_worker/service_worker_network_provider.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/child/service_worker/service_worker_network_provider.h"
 
 #include "base/atomic_sequence_num.h"
 #include "content/child/child_thread.h"
 #include "content/common/service_worker/service_worker_messages.h"
 
@@ skipping 31 matching lines @@
       new ServiceWorkerHostMsg_ProviderCreated(provider_id_));
 }
 
 ServiceWorkerNetworkProvider::~ServiceWorkerNetworkProvider() {
   if (!ChildThread::current())
     return;  // May be null in some tests.
   ChildThread::current()->Send(
       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