Move DeviceMonitorLinux to //device/core.

device/hid/device_monitor_linux.h

-// Copyright 2014 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 DEVICE_HID_DEVICE_MONITOR_LINUX_H_
-#define DEVICE_HID_DEVICE_MONITOR_LINUX_H_
-
-#include <memory>
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/message_loop/message_loop.h"
-#include "base/message_loop/message_pump_libevent.h"
-#include "base/observer_list.h"
-#include "base/threading/thread_checker.h"
-#include "device/udev_linux/scoped_udev.h"
-
-struct udev_device;
-
-namespace device {
-
-// This class listends for notifications from libudev about
-// connected/disconnected devices. This class is *NOT* thread-safe and
-// all methods must be accessed from the FILE thread.
-class DeviceMonitorLinux : public base::MessageLoop::DestructionObserver,
-                           public base::MessagePumpLibevent::Watcher {
- public:
-  typedef base::Callback<void(udev_device* device)> EnumerateCallback;
-
-  class Observer {
-   public:
-    virtual ~Observer() {}
-    virtual void OnDeviceAdded(udev_device* device) = 0;
-    virtual void OnDeviceRemoved(udev_device* device) = 0;
-  };
-
-  DeviceMonitorLinux();
-
-  static DeviceMonitorLinux* GetInstance();
-  static bool HasInstance();
-
-  void AddObserver(Observer* observer);
-  void RemoveObserver(Observer* observer);
-
-  ScopedUdevDevicePtr GetDeviceFromPath(const std::string& path);
-  void Enumerate(const EnumerateCallback& callback);
-
-  // Implements base::MessageLoop::DestructionObserver
-  void WillDestroyCurrentMessageLoop() override;
-
-  // Implements base::MessagePumpLibevent::Watcher
-  void OnFileCanReadWithoutBlocking(int fd) override;
-  void OnFileCanWriteWithoutBlocking(int fd) override;
-
- private:
-  friend std::default_delete<DeviceMonitorLinux>;
-
-  ~DeviceMonitorLinux() override;
-
-  ScopedUdevPtr udev_;
-  ScopedUdevMonitorPtr monitor_;
-  int monitor_fd_;
-  base::MessagePumpLibevent::FileDescriptorWatcher monitor_watcher_;
-
-  base::ObserverList<Observer, true> observers_;
-
-  base::ThreadChecker thread_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(DeviceMonitorLinux);
-};
-
-}  // namespace device
-
-#endif  // DEVICE_HID_DEVICE_MONITOR_LINUX_H_