Cascade shutdown of instances

mash/shell/shell_application_delegate.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/shell/shell_application_delegate.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/message_loop/message_loop.h"
+#include "mash/login/public/interfaces/login.mojom.h"
 #include "mojo/shell/public/cpp/connection.h"
 #include "mojo/shell/public/cpp/connector.h"
 
 namespace mash {
 namespace shell {
 
 ShellApplicationDelegate::ShellApplicationDelegate()
     : connector_(nullptr), screen_locked_(false) {}
 
 ShellApplicationDelegate::~ShellApplicationDelegate() {}
 
 void ShellApplicationDelegate::Initialize(mojo::Connector* connector,
                                           const mojo::Identity& identity,
                                           uint32_t id) {
   connector_ = connector;
   StartBrowserDriver();
   StartWindowManager();
   StartSystemUI();
   StartQuickLaunch();
 }
 
 bool ShellApplicationDelegate::AcceptConnection(mojo::Connection* connection) {
   connection->AddInterface<mojom::Shell>(this);
   return true;
 }
 
+void ShellApplicationDelegate::Logout() {
+  // TODO(beng): Notify connected listeners that login is happening, potentially
+  // give them the option to stop it.
+  mash::login::mojom::LoginPtr login;
+  connector_->ConnectToInterface("mojo:login", &login);
+  login->ShowLoginUI();
+  // This kills the user environment.
+  base::MessageLoop::current()->QuitWhenIdle();
+}
+
+void ShellApplicationDelegate::SwitchUser() {
+  mash::login::mojom::LoginPtr login;
+  connector_->ConnectToInterface("mojo:login", &login);
+  login->SwitchUser();
+}
+
 void ShellApplicationDelegate::AddScreenlockStateListener(
     mojom::ScreenlockStateListenerPtr listener) {
   listener->ScreenlockStateChanged(screen_locked_);
   screenlock_listeners_.AddInterfacePtr(std::move(listener));
 }
 
 void ShellApplicationDelegate::LockScreen() {
   if (screen_locked_)
     return;
   screen_locked_ = true;
@@ skipping 69 matching lines @@
   // Note: |connection| may be null if we've lost our connection to the shell.
   if (connection) {
     connection->SetConnectionLostClosure(restart_callback);
     connection->AddInterface<mojom::Shell>(this);
     connections_[url] = std::move(connection);
   }
 }
 
 }  // namespace shell
 }  // namespace main