Browser side of new ServiceWorker 'sync' event.

content/renderer/service_worker/embedded_worker_context_client.cc

Index: content/renderer/service_worker/embedded_worker_context_client.cc
diff --git a/content/renderer/service_worker/embedded_worker_context_client.cc b/content/renderer/service_worker/embedded_worker_context_client.cc
index c0e1191388f8a5aa6e3504e87006e92694365446..db3f4e569ec1d1d677227bb5376b5d5bee55645d 100644
--- a/content/renderer/service_worker/embedded_worker_context_client.cc
+++ b/content/renderer/service_worker/embedded_worker_context_client.cc
@@ -145,6 +145,11 @@ void EmbeddedWorkerContextClient::didHandleFetchEvent(
       request_id, SERVICE_WORKER_FETCH_EVENT_RESULT_RESPONSE, response);
 }
 
+void EmbeddedWorkerContextClient::didHandleSyncEvent(int request_id) {
+  DCHECK(script_context_);
+  script_context_->DidHandleSyncEvent(request_id);
+}
+
 void EmbeddedWorkerContextClient::OnSendMessageToWorker(
     int thread_id,
     int embedded_worker_id,