Use udev for serial device enumeration on Linux

device/serial/serial_device_enumerator_mac.h

Index: device/serial/serial_device_enumerator_mac.h
diff --git a/device/serial/serial_device_enumerator_mac.h b/device/serial/serial_device_enumerator_mac.h
new file mode 100644
index 0000000000000000000000000000000000000000..e78cc8c18b9d572457df1167447e870b7eb27ef0
--- /dev/null
+++ b/device/serial/serial_device_enumerator_mac.h
@@ -0,0 +1,28 @@
+// 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_MAC_H_
+#define DEVICE_SERIAL_SERIAL_DEVICE_ENUMERATOR_MAC_H_
+
+#include "device/serial/serial_device_enumerator.h"
+#include "device/serial/serial_device_info.h"
+
+namespace device {
+
+// Discovers and enumerates serial devices available to the host.
+class SerialDeviceEnumeratorMac : public SerialDeviceEnumerator {
+ public:
+  SerialDeviceEnumeratorMac();
+  virtual ~SerialDeviceEnumeratorMac();
+
+  // Implementation for SerialDeviceEnumerator.
+  virtual void GetDevices(std::vector<SerialDeviceInfo>* devices) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SerialDeviceEnumeratorMac);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_SERIAL_SERIAL_DEVICE_ENUMERATOR_MAC_H_