Add a test for application lifecycle

mojo/shell/tests/lifecycle/app_client.cc

+// Copyright 2016 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 "mojo/shell/tests/lifecycle/app_client.h"
+
+#include "mojo/shell/public/cpp/shell_connection.h"
+
+namespace mojo {
+namespace shell {
+namespace test {
+
+AppClient::AppClient() {}
+AppClient::AppClient(shell::mojom::ShellClientRequest request)
+    : connection_(new ShellConnection(this, std::move(request))) {}
+AppClient::~AppClient() {}
+
+bool AppClient::AcceptConnection(mojo::Connection* connection) {
+  connection->AddInterface<LifecycleControl>(this);
+  return true;
+}
+
+void AppClient::Create(mojo::Connection* connection,
+                       LifecycleControlRequest request) {
+  bindings_.AddBinding(this, std::move(request));
+}
+
+void AppClient::Ping(const PingCallback& callback) {
+  callback.Run();
+}
+
+void AppClient::GracefulQuit() {
+  base::MessageLoop::current()->QuitWhenIdle();
+}
+
+void AppClient::Crash() {
+  // Rather than actually crash, which causes a bunch of console spray and
+  // maybe UI clutter on some platforms, just exit without shutting anything
+  // down properly.
+  exit(1);
+}
+
+void AppClient::CloseShellConnection() {
+  DCHECK(runner_);
+  runner_->DestroyShellConnection();
+  // Quit the app once the caller goes away.
+  bindings_.set_connection_error_handler(
+      base::Bind(&AppClient::BindingLost, base::Unretained(this)));
+}
+
+void AppClient::BindingLost() {
+  if (bindings_.empty())
+    GracefulQuit();
+}
+
+}  // namespace test
+}  // namespace shell
+}  // namespace mojo
+
+