Refactor ArcBridgeService detection and initialization to a separate class ArcServiceLauncher.

chrome/browser/chromeos/arc/arc_service_launcher.h

+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_ARC_ARC_SERVICE_LAUNCHER_H_
+#define CHROME_BROWSER_CHROMEOS_ARC_ARC_SERVICE_LAUNCHER_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "components/arc/arc_service_manager.h"
+
+namespace arc {
+
+// Detects ARC availability and launches ARC bridge service.
+class ArcServiceLauncher {
+ public:
+  ArcServiceLauncher();
+  ~ArcServiceLauncher();
+
+  void Launch();

[xiyuan, 2016/02/26 17:38:01]

nit: Launch -> Initialize, Initialize is used in association with Shutdown

[arthurhsu, 2016/02/26 19:10:06]

Done.

+  void Shutdown();
+
+ private:
+  // DBus callback.
+  void OnArcAvailable(bool available);
+
+  base::ThreadChecker thread_checker_;
+  scoped_ptr<ArcServiceManager> arc_service_manager_;
+  base::WeakPtrFactory<ArcServiceLauncher> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcServiceLauncher);
+};
+
+}  // namespace arc
+
+#endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_SERVICE_LAUNCHER_H_