Add DeviceMonitorLinux in BrowserMainLoop.

content/browser/device_monitor_linux.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.
+
+// This class is used to detect device change and notify base::SystemMonitor
+// on Linux.
+
+#ifndef CONTENT_BROWSER_DEVICE_MONITOR_LINUX_H_
+#define CONTENT_BROWSER_DEVICE_MONITOR_LINUX_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
+
+extern "C" {
+struct udev_device;
+}
+
+namespace content {
+
+class UdevLinux;
+
+class DeviceMonitorLinux : public MessageLoop::DestructionObserver {
+ public:
+  DeviceMonitorLinux();
+  virtual ~DeviceMonitorLinux();
+
+ private:
+  // This object is deleted on the UI thread after the IO thread has been
+  // destroyed. Need to know when IO thread is being destroyed so that
+  // we can delete udev_.
+  virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
+
+  virtual void Initialize();

[Lei Zhang, 2012/07/31 02:40:12]

This doesn't need to be virtual?

[wjia(left Chromium), 2012/07/31 02:53:10]

removed.

+  void OnDevicesChanged(udev_device* device);
+
+  scoped_ptr<UdevLinux> udev_;
+
+  // Hold a pointer to the IO loop to check we delete udev_ on the right thread.
+  MessageLoop* io_loop_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeviceMonitorLinux);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_DEVICE_MONITOR_LINUX_H_