Add a user id parameter to connections

components/mus/mus_app.cc

Index: components/mus/mus_app.cc
diff --git a/components/mus/mus_app.cc b/components/mus/mus_app.cc
index c932378d56711d6436c42f37a5c6004c77468541..ea2410b673fa0508d85e88cba2d0e057aa9a2558 100644
--- a/components/mus/mus_app.cc
+++ b/components/mus/mus_app.cc
@@ -94,7 +94,8 @@ void MandolineUIServicesApp::InitializeResources(mojo::Shell* shell) {
 
 void MandolineUIServicesApp::Initialize(mojo::Shell* shell,
                                         const std::string& url,
-                                        uint32_t id) {
+                                        uint32_t id,
+                                        uint32_t user_id) {
   shell_ = shell;
   surfaces_state_ = new SurfacesState;