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 1669826a4588bb62ac1376f3f3e29fd642730f41..ffa21211bcf7912c778964d602ceb540bde34f5d 100644
--- a/content/renderer/service_worker/embedded_worker_context_client.cc
+++ b/content/renderer/service_worker/embedded_worker_context_client.cc
@@ -202,6 +202,11 @@ EmbeddedWorkerContextClient::createServiceWorkerNetworkProvider(
   return new WebServiceWorkerNetworkProviderImpl();
 }
 
+void EmbeddedWorkerContextClient::didHandleSyncEvent(int request_id) {
+  DCHECK(script_context_);
+  script_context_->DidHandleSyncEvent(request_id);
+}
+
 void EmbeddedWorkerContextClient::OnSendMessageToWorker(
     int thread_id,
     int embedded_worker_id,