Web MIDI: introduce MidiService class

content/browser/media/midi_host.h

 // 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.
 
 #ifndef CONTENT_BROWSER_MEDIA_MIDI_HOST_H_
 #define CONTENT_BROWSER_MEDIA_MIDI_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "base/synchronization/lock.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "content/public/browser/browser_thread.h"
 #include "media/midi/midi_manager.h"
 #include "media/midi/midi_port_info.h"
 #include "media/midi/midi_service.mojom.h"
 
 namespace midi {
-class MidiManager;
+class MidiService;
 class MidiMessageQueue;
 }  // namespace midi
 
 namespace content {
 
 class CONTENT_EXPORT MidiHost : public BrowserMessageFilter,
                                 public midi::MidiManagerClient {
  public:
   // Called from UI thread from the owner of this object.
-  MidiHost(int renderer_process_id, midi::MidiManager* midi_manager);
+  MidiHost(int renderer_process_id, midi::MidiService* midi_service);
 
   // BrowserMessageFilter implementation.
   void OnChannelClosing() override;
   void OnDestruct() const override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // MidiManagerClient implementation.
   void CompleteStartSession(midi::mojom::Result result) override;
   void AddInputPort(const midi::MidiPortInfo& info) override;
   void AddOutputPort(const midi::MidiPortInfo& info) override;
@@ skipping 25 matching lines @@
 
   int renderer_process_id_;
 
   // Represents if the renderer has a permission to send/receive MIDI SysEX
   // messages.
   bool has_sys_ex_permission_;
 
   // Represents if a session is requested to start.
   bool is_session_requested_;
 
-  // |midi_manager_| talks to the platform-specific MIDI APIs.
-  // It can be NULL if the platform (or our current implementation)
-  // does not support MIDI.  If not supported then a call to
-  // OnRequestAccess() will always refuse access and a call to
-  // OnSendData() will do nothing.
-  midi::MidiManager* midi_manager_;
+  // |midi_service_| manages a MidiManager instance that talks to
+  // platform-specific MIDI APIs.  It can be nullptr after detached.
+  midi::MidiService* midi_service_;
 
   // Buffers where data sent from each MIDI input port is stored.
   ScopedVector<midi::MidiMessageQueue> received_messages_queues_;
 
   // Protects access to |received_messages_queues_|;
   base::Lock messages_queues_lock_;
 
   // The number of bytes sent to the platform-specific MIDI sending
   // system, but not yet completed.
   size_t sent_bytes_in_flight_;
@@ skipping 10 matching lines @@
 
   // Protects access to |output_port_count_|.
   base::Lock output_port_count_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(MidiHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_MIDI_HOST_H_