Require udev for MidiManagerAlsa

media/midi/midi_manager_alsa.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 MEDIA_MIDI_MIDI_MANAGER_ALSA_H_
 #define MEDIA_MIDI_MIDI_MANAGER_ALSA_H_
 
 #include <alsa/asoundlib.h>
 #include <map>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/stl_util.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread.h"
 #include "base/values.h"
+#include "device/udev_linux/scoped_udev.h"
 #include "media/midi/midi_manager.h"
 
 namespace media {
 
 class MEDIA_EXPORT MidiManagerAlsa final : public MidiManager {
  public:
   MidiManagerAlsa();
   ~MidiManagerAlsa() override;
 
   // MidiManager implementation.
@@ skipping 275 matching lines @@
   int in_port_id_;
   OutPortMap out_ports_;       // guarded by out_ports_lock_
   base::Lock out_ports_lock_;  // guards out_ports_
 
   // Mapping from ALSA client:port to our index.
   SourceMap source_map_;
 
   // ALSA event -> MIDI coder.
   snd_midi_event_t* decoder_;
 
+  // udev, for querying hardware devices.
+  device::ScopedUdevPtr udev_;
+
   base::Thread send_thread_;
   base::Thread event_thread_;
 
   bool event_thread_shutdown_;  // guarded by shutdown_lock_
   base::Lock shutdown_lock_;    // guards event_thread_shutdown_
 
   DISALLOW_COPY_AND_ASSIGN(MidiManagerAlsa);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MIDI_MIDI_MANAGER_ALSA_H_