arc: Add ArcServiceManager to own all future ARC services

components/arc/arc_service_manager.h

+// 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.
+
+#ifndef COMPONENTS_ARC_ARC_SERVICE_MANAGER_H_
+#define COMPONENTS_ARC_ARC_SERVICE_MANAGER_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace base {
+
+class SequencedTaskRunner;
+class SingleThreadTaskRunner;
+
+}  // namespace base
+
+namespace arc {
+
+class ArcBridgeService;
+
+// Manages creation and destruction of ARC related services.
+class ArcServiceManager {

[oshima, 2015/12/04 18:33:34]

Consider adding comment to avoid adding unrelated code/features other than
managing services. It can become "the place to add misc stuff".

[denniskempin, 2015/12/04 19:12:25]

Done.

+ public:
+  ArcServiceManager(
+      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
+      const scoped_refptr<base::SequencedTaskRunner>& file_task_runner);
+  virtual ~ArcServiceManager();
+
+  // |arc_bridge_service| can only be accessed on the thread that this
+  // class was created on.
+  ArcBridgeService* arc_bridge_service();
+
+  // Gets the global instance of the ARC Service Manager. This can only be
+  // called on the thread that this class was created on.
+  static ArcServiceManager* Get();
+
+ private:
+  scoped_refptr<base::SequencedTaskRunner> origin_task_runner_;
+  scoped_ptr<ArcBridgeService> arc_bridge_service_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcServiceManager);
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_ARC_ARC_SERVICE_MANAGER_H_