Web MIDI: make MidiManagerMac notify device connections

media/midi/midi_port_info.h

 // Copyright (c) 2013 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 MEDIA_MIDI_MIDI_PORT_INFO_H_
 #define MEDIA_MIDI_MIDI_PORT_INFO_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
+enum MidiPortState {
+  MIDI_PORT_DISCONNECTED,
+  MIDI_PORT_CONNECTED,
+  MIDI_PORT_OPENED,
+  MIDI_PORT_STATE_LAST = MIDI_PORT_OPENED,
+};
+
 struct MEDIA_EXPORT MidiPortInfo {
   MidiPortInfo();
   MidiPortInfo(const std::string& in_id,
                const std::string& in_manufacturer,
                const std::string& in_name,
-               const std::string& in_version);
+               const std::string& in_version,
+               MidiPortState in_state);
 
   MidiPortInfo(const MidiPortInfo& info);
   ~MidiPortInfo();
 
   std::string id;
   std::string manufacturer;
   std::string name;
   std::string version;
+  MidiPortState state;
 };
 
 typedef std::vector<MidiPortInfo> MidiPortInfoList;
 
 }  // namespace media
 
 #endif  // MEDIA_MIDI_MIDI_PORT_INFO_H_