Add a instance groups to Connect(), and introduce an Identity struct.

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 86 matching lines @@
     RootWindowsObserver* observer) {
   root_windows_observers_.RemoveObserver(observer);
 }
 
 void WindowManagerApplication::OnAcceleratorRegistrarDestroyed(
     AcceleratorRegistrarImpl* registrar) {
   accelerator_registrars_.erase(registrar);
 }
 
 void WindowManagerApplication::Initialize(mojo::Connector* connector,
-                                          const std::string& url,
-                                          const std::string& user_id,
+                                          const mojo::Identity& identity,
                                           uint32_t id) {
   connector_ = connector;
-  tracing_.Initialize(connector, url);
+  tracing_.Initialize(connector, identity.name());
 
   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());
 }
 
 bool WindowManagerApplication::AcceptConnection(mojo::Connection* connection) {
   connection->AddInterface<mash::wm::mojom::UserWindowController>(this);
   connection->AddInterface<mus::mojom::AcceleratorRegistrar>(this);
-  if (connection->GetRemoteApplicationName() == "mojo:mash_shell")
+  if (connection->GetRemoteIdentity().name() == "mojo:mash_shell")
     connection->GetInterface(&mash_shell_);
   return true;
 }
 
 void WindowManagerApplication::Create(
     mojo::Connection* connection,
     mojo::InterfaceRequest<mash::wm::mojom::UserWindowController> request) {
   if (!root_controllers_.empty() && (*root_controllers_.begin())->root()) {
     user_window_controller_binding_.AddBinding(user_window_controller_.get(),
                                                std::move(request));
@@ skipping 24 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