Web MIDI: add dynamic MidiManager instantiation support for Linux

media/midi/midi_manager_winrt.cc

 // Copyright 2016 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_winrt.h"
 
 #pragma warning(disable : 4467)
 
 #include <initguid.h>  // Required by <devpkey.h>
 
@@ skipping 889 matching lines @@
 
     return weak_factory_.GetWeakPtr();
   }
 
   // Last member to ensure destructed first.
   base::WeakPtrFactory<MidiOutPortManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MidiOutPortManager);
 };
 
-MidiManagerWinrt::MidiManagerWinrt() : com_thread_("Windows MIDI COM Thread") {}
+MidiManagerWinrt::MidiManagerWinrt(MidiService* service)
+    : MidiManager(service), com_thread_("Windows MIDI COM Thread") {}
 
 MidiManagerWinrt::~MidiManagerWinrt() {
   base::AutoLock auto_lock(lazy_init_member_lock_);
 
   CHECK(!com_thread_checker_);
   CHECK(!port_manager_in_);
   CHECK(!port_manager_out_);
   CHECK(!scheduler_);
 }
 
@@ skipping 119 matching lines @@
 
 void MidiManagerWinrt::OnPortManagerReady() {
   DCHECK(com_thread_checker_->CalledOnValidThread());
   DCHECK(port_manager_ready_count_ < 2);
 
   if (++port_manager_ready_count_ == 2)
     CompleteInitialization(Result::OK);
 }
 
 }  // namespace midi