Add DeviceMonitorLinux in BrowserMainLoop.

content/browser/devices_monitor/devices_monitor.h

+// Copyright (c) 2012 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.
+
+// The base class used to detect device change and notify base::SystemMonitor.
+
+#ifndef CONTENT_BROWSER_DEVICES_MONITOR_DEVICES_MONITOR_H_
+#define CONTENT_BROWSER_DEVICES_MONITOR_DEVICES_MONITOR_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/system_monitor/system_monitor.h"
+
+namespace content {
+
+class DevicesMonitor {
+ public:
+  static DevicesMonitor* Create();
+
+  DevicesMonitor();
+  virtual ~DevicesMonitor();
+
+  virtual void Start(base::SystemMonitor::DevicesChangedObserver* observer) = 0;

[tommi (sloooow) - chröme, 2012/07/30 11:07:04]

I'm not grokking why we need to support observers here.  Can't we push
notifications into SystemMonitor in the same way as SystemMessageWindowWin does
on Windows?

+  virtual void Stop(base::SystemMonitor::DevicesChangedObserver* observer) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DevicesMonitor);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_DEVICES_MONITOR_DEVICES_MONITOR_H_