Add a user id parameter to connections

mash/shell/shell_application_delegate.cc

Index: mash/shell/shell_application_delegate.cc
diff --git a/mash/shell/shell_application_delegate.cc b/mash/shell/shell_application_delegate.cc
index c538b7346bf378fb2a371d489126499c9165eb3f..99725144b4c6a12a73c2f53773a473051b4031b9 100644
--- a/mash/shell/shell_application_delegate.cc
+++ b/mash/shell/shell_application_delegate.cc
@@ -19,7 +19,8 @@ ShellApplicationDelegate::~ShellApplicationDelegate() {}
 
 void ShellApplicationDelegate::Initialize(mojo::Shell* shell,
                                           const std::string& url,
-                                          uint32_t id) {
+                                          uint32_t id,
+                                          uint32_t user_id) {
   shell_ = shell;
   StartBrowserDriver();
   StartWindowManager();