Web MIDI: add dynamic MidiManager instantiation support for Linux

media/midi/midi_manager_mac.cc

 // 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.
 
 #include "media/midi/midi_manager_mac.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 86 matching lines @@
   return static_cast<double>(nanoseconds) / 1.0e9;
 }
 
 MIDITimeStamp SecondsToMIDITimeStamp(double seconds) {
   UInt64 nanos = UInt64(seconds * 1.0e9);
   return AudioConvertNanosToHostTime(nanos);
 }
 
 }  // namespace
 
-MidiManager* MidiManager::Create() {
-  return new MidiManagerMac();
+MidiManager* MidiManager::Create(MidiService* service) {
+  return new MidiManagerMac(service);
 }
 
-MidiManagerMac::MidiManagerMac()
-    : midi_client_(0),
+MidiManagerMac::MidiManagerMac(MidiService* service)
+    : MidiManager(service),
+      midi_client_(0),
       coremidi_input_(0),
       coremidi_output_(0),
       client_thread_("MidiClientThread"),
-      shutdown_(false) {
-}
+      shutdown_(false) {}
 
 MidiManagerMac::~MidiManagerMac() = default;
 
 void MidiManagerMac::StartInitialization() {
   // MIDIClient should be created on |client_thread_| to receive CoreMIDI event
   // notifications.
   RunOnClientThread(
       base::Bind(&MidiManagerMac::InitializeCoreMIDI, base::Unretained(this)));
 }
 
@@ skipping 253 matching lines @@
         &data[sent_size]);
     DCHECK(midi_packet);
 
     MIDISend(coremidi_output_, destination, packet_list);
   }
 
   AccumulateMidiBytesSent(client, data.size());
 }
 
 }  // namespace midi