Add a mojo ServiceRegistry to embedded workers.

content/renderer/service_worker/service_worker_context_client.cc

Index: content/renderer/service_worker/service_worker_context_client.cc
diff --git a/content/renderer/service_worker/service_worker_context_client.cc b/content/renderer/service_worker/service_worker_context_client.cc
index 93edf9847eca5c96a45939f8004dace04551a531..f14883191585e64616eec1b4dd46b16cf60aeeb4 100644
--- a/content/renderer/service_worker/service_worker_context_client.cc
+++ b/content/renderer/service_worker/service_worker_context_client.cc
@@ -271,6 +271,13 @@ void ServiceWorkerContextClient::OnMessageReceived(
   DCHECK(handled);
 }
 
+void ServiceWorkerContextClient::BindServiceRegistry(
+    mojo::InterfaceRequest<mojo::ServiceProvider> services,
+    mojo::ServiceProviderPtr exposed_services) {
+  service_registry_.Bind(services.Pass());
+  service_registry_.BindRemoteServiceProvider(exposed_services.Pass());
+}
+
 blink::WebURL ServiceWorkerContextClient::scope() const {
   return service_worker_scope_;
 }