Change userid from a uint32_t to a string guid

mash/wm/window_manager_application.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mash/wm/window_manager_application.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "components/mus/public/cpp/event_matcher.h"
@@ skipping 87 matching lines @@
   root_windows_observers_.RemoveObserver(observer);
 }
 
 void WindowManagerApplication::OnAcceleratorRegistrarDestroyed(
     AcceleratorRegistrarImpl* registrar) {
   accelerator_registrars_.erase(registrar);
 }
 
 void WindowManagerApplication::Initialize(mojo::Connector* connector,
                                           const std::string& url,
-                                          uint32_t id,
-                                          uint32_t user_id) {
+                                          const std::string& user_id,
+                                          uint32_t id) {
   connector_ = connector;
   tracing_.Initialize(connector, url);
 
   mus::mojom::WindowManagerFactoryServicePtr wm_factory_service;
   connector_->ConnectToInterface("mojo:mus", &wm_factory_service);
   wm_factory_service->SetWindowManagerFactory(
       window_manager_factory_binding_.CreateInterfacePtrAndBind());
 
   user_window_controller_.reset(new UserWindowControllerImpl());
 }
@@ skipping 39 matching lines @@
 
 void WindowManagerApplication::CreateWindowManager(
     mus::mojom::DisplayPtr display,
     mojo::InterfaceRequest<mus::mojom::WindowTreeClient> client_request) {
   root_controllers_.insert(RootWindowController::CreateFromDisplay(
       this, std::move(display), std::move(client_request)));
 }
 
 }  // namespace wm
 }  // namespace mash