Web MIDI: add dynamic MidiManager instantiation support for Linux

media/midi/midi_manager_usb.cc

 // 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.
 
 #include "media/midi/midi_manager_usb.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "media/midi/midi_scheduler.h"
 #include "media/midi/usb_midi_descriptor_parser.h"
 
 namespace midi {
 
 using mojom::PortState;
 using mojom::Result;
 
-MidiManagerUsb::MidiManagerUsb(std::unique_ptr<UsbMidiDevice::Factory> factory)
-    : device_factory_(std::move(factory)) {}
+MidiManagerUsb::MidiManagerUsb(MidiService* service,
+                               std::unique_ptr<UsbMidiDevice::Factory> factory)
+    : MidiManager(service), device_factory_(std::move(factory)) {}
 
 MidiManagerUsb::~MidiManagerUsb() {
   base::AutoLock auto_lock(scheduler_lock_);
   CHECK(!scheduler_);
 }
 
 void MidiManagerUsb::StartInitialization() {
   Initialize(
       base::Bind(&MidiManager::CompleteInitialization, base::Unretained(this)));
 }
@@ skipping 130 matching lines @@
       DCHECK_EQ(jacks[j].direction(), UsbMidiJack::DIRECTION_IN);
       input_stream_->Add(jacks[j]);
       AddInputPort(MidiPortInfo(id, manufacturer, product_name, version,
                                 PortState::OPENED));
     }
   }
   return true;
 }
 
 }  // namespace midi