Web MIDI: add dynamic MidiManager instantiation support for Linux

media/midi/midi_manager_android.h

 // Copyright 2015 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_ANDROID_H_
 #define MEDIA_MIDI_MIDI_MANAGER_ANDROID_H_
 
 #include <jni.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/scoped_vector.h"
 #include "base/synchronization/lock.h"
 #include "base/time/time.h"
 #include "media/midi/midi_input_port_android.h"
 #include "media/midi/midi_manager.h"
 #include "media/midi/midi_scheduler.h"
 
 namespace midi {
 
 class MidiDeviceAndroid;
 class MidiOutputPortAndroid;
+class MidiService;
 
 // MidiManagerAndroid is a MidiManager subclass for Android M or newer. For
 // older android OSes, we use MidiManagerUsb.
 class MidiManagerAndroid final : public MidiManager,
                                  public MidiInputPortAndroid::Delegate {
  public:
-  MidiManagerAndroid();
+  explicit MidiManagerAndroid(MidiService* service);
   ~MidiManagerAndroid() override;
 
   // MidiManager implementation.
   void StartInitialization() override;
   void Finalize() override;
   void DispatchSendMidiData(MidiManagerClient* client,
                             uint32_t port_index,
                             const std::vector<uint8_t>& data,
                             double timestamp) override;
 
@@ skipping 43 matching lines @@
 
   // Lock to ensure the MidiScheduler is being destructed only once in
   // Finalize() on Chrome_IOThread.
   base::Lock scheduler_lock_;
   std::unique_ptr<MidiScheduler> scheduler_;  // GUARDED_BY(scheduler_lock_)
 };
 
 }  // namespace midi
 
 #endif  // MEDIA_MIDI_MIDI_MANAGER_ANDROID_H_