Add a user id parameter to connections

ash/mus/sysui_application.h

Index: ash/mus/sysui_application.h
diff --git a/ash/mus/sysui_application.h b/ash/mus/sysui_application.h
index d7bebe5bb7e96eb295108c261d22412826b29d9f..c09804e8862aa1c3884387d094dd9a5283c1480b 100644
--- a/ash/mus/sysui_application.h
+++ b/ash/mus/sysui_application.h
@@ -24,7 +24,8 @@ class SysUIApplication : public mojo::ShellClient {
   // mojo::ShellClient:
   void Initialize(mojo::Shell* shell,
                   const std::string& url,
-                  uint32_t id) override;
+                  uint32_t id,
+                  uint32_t user_id) override;
   bool AcceptConnection(mojo::Connection* connection) override;
 
   mojo::TracingImpl tracing_;