Use udev for serial device enumeration on Linux

device/serial/serial_device_enumerator.h

Index: device/serial/serial_device_enumerator.h
diff --git a/device/serial/serial_device_enumerator.h b/device/serial/serial_device_enumerator.h
new file mode 100644
index 0000000000000000000000000000000000000000..5f76845674eb5e730f347f964932ba5031e9289a
--- /dev/null
+++ b/device/serial/serial_device_enumerator.h
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+// Copyright (c) 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_SERIAL_SERIAL_DEVICE_ENUMERATOR_H_
+#define DEVICE_SERIAL_SERIAL_DEVICE_ENUMERATOR_H_
+
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "device/serial/serial_device_info.h"
+
+namespace device {
+
+// Discovers and enumerates serial devices available to the host.
+class SerialDeviceEnumerator {
+ public:
+  static scoped_ptr<SerialDeviceEnumerator> Create();
+
+  SerialDeviceEnumerator();
+  virtual ~SerialDeviceEnumerator();
+
+  virtual void GetDevices(std::vector<SerialDeviceInfo>* devices) = 0;
+};
+
+}  // namespace device
+
+#endif  // DEVICE_SERIAL_SERIAL_DEVICE_ENUMERATOR_H_