Create SystemRoutineController

This change introduces the SystemRoutineController class that connects
to the cros_healthd DiagnosticsService. Subsequent CLs will declare and
implement a SystemRoutineController mojo interface.

Bug: 1128204
Change-Id: Ic510e1f90efedbbcba42827ca843323f04803e1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2457807Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816182}

chromeos/components/diagnostics_ui/backend/BUILD.gn

@@ -12,6 +12,8 @@ static_library("backend") {
     "power_manager_client_conversions.h",
     "system_data_provider.cc",
     "system_data_provider.h",
+    "system_routine_controller.cc",
+    "system_routine_controller.h",
   ]
 
   deps = [
@@ -30,6 +32,7 @@ source_set("unit_tests") {
   sources = [
     "power_manager_client_conversions_unittest.cc",
     "system_data_provider_unittest.cc",
+    "system_routine_controller_unittest.cc",
   ]
 
   deps = [

chromeos/components/diagnostics_ui/backend/system_routine_controller.cc

+// Copyright 2020 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 "chromeos/components/diagnostics_ui/backend/system_routine_controller.h"
+
+#include "base/bind.h"
+#include "chromeos/services/cros_healthd/public/cpp/service_connection.h"
+
+namespace chromeos {
+namespace diagnostics {
+
+void SystemRoutineController::BindCrosHealthdDiagnosticsServiceIfNeccessary() {
+  if (!diagnostics_service_ || !diagnostics_service_.is_connected()) {
+    cros_healthd::ServiceConnection::GetInstance()->GetDiagnosticsService(
+        diagnostics_service_.BindNewPipeAndPassReceiver());
+    diagnostics_service_.set_disconnect_handler(base::BindOnce(
+        &SystemRoutineController::OnDiagnosticsServiceDisconnected,
+        base::Unretained(this)));
+  }
+}
+
+void SystemRoutineController::OnDiagnosticsServiceDisconnected() {
+  diagnostics_service_.reset();
+}
+
+}  // namespace diagnostics
+}  // namespace chromeos

chromeos/components/diagnostics_ui/backend/system_routine_controller.h

+// Copyright 2020 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.
+
+#ifndef CHROMEOS_COMPONENTS_DIAGNOSTICS_UI_BACKEND_SYSTEM_ROUTINE_CONTROLLER_H_
+#define CHROMEOS_COMPONENTS_DIAGNOSTICS_UI_BACKEND_SYSTEM_ROUTINE_CONTROLLER_H_
+
+#include "chromeos/services/cros_healthd/public/mojom/cros_healthd.mojom.h"
+#include "mojo/public/cpp/bindings/remote.h"
+
+namespace chromeos {
+namespace diagnostics {
+
+class SystemRoutineController {
+ public:
+  SystemRoutineController();
+  ~SystemRoutineController();
+
+  SystemRoutineController(const SystemRoutineController&) = delete;
+  SystemRoutineController& operator=(const SystemRoutineController&) = delete;
+
+ private:
+  void BindCrosHealthdDiagnosticsServiceIfNeccessary();
+
+  void OnDiagnosticsServiceDisconnected();
+
+  mojo::Remote<cros_healthd::mojom::CrosHealthdDiagnosticsService>
+      diagnostics_service_;
+};
+
+}  // namespace diagnostics
+}  // namespace chromeos
+
+#endif  // CHROMEOS_COMPONENTS_DIAGNOSTICS_UI_BACKEND_SYSTEM_ROUTINE_CONTROLLER_H_

chromeos/components/diagnostics_ui/backend/system_routine_controller_unittest.cc

+// Copyright 2020 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 "chromeos/components/diagnostics_ui/backend/system_routine_controller.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace chromeos {
+namespace diagnostics {
+
+class SystemRoutineControllerTest : public testing::Test {
+  SystemRoutineControllerTest() = default;
+  ~SystemRoutineControllerTest() override = default;
+};
+
+}  // namespace diagnostics
+}  // namespace chromeos