Web MIDI: distributes MIDIPort information asynchronously

content/renderer/media/midi_message_filter.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_RENDERER_MEDIA_MIDI_MESSAGE_FILTER_H_
 #define CONTENT_RENDERER_MEDIA_MIDI_MESSAGE_FILTER_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 50 matching lines @@
   void Send(IPC::Message* message);
 
   // IPC::MessageFilter override. Called on |io_message_loop|.
   virtual bool OnMessageReceived(const IPC::Message& message) override;
   virtual void OnFilterAdded(IPC::Sender* sender) override;
   virtual void OnFilterRemoved() override;
   virtual void OnChannelClosing() override;
 
   // Called when the browser process has approved (or denied) access to
   // MIDI hardware.
-  // TODO(toyoshim): MidiPortInfoList objects should be notified separately
-  // port by port.
-  void OnSessionStarted(media::MidiResult result,
-                        media::MidiPortInfoList inputs,
-                        media::MidiPortInfoList outputs);
+  void OnSessionStarted(media::MidiResult result);
+
+  // Called on two cases. One is just before OnSessionStarted() is called to
+  // notify initial port information that already exist. The other is to add
+  // new port information when a new device is connected.
+  void OnAddInputPort(media::MidiPortInfo info);
+  void OnAddOutputPort(media::MidiPortInfo info);
 
   // Called when the browser process has sent MIDI data containing one or
   // more messages.
   void OnDataReceived(uint32 port,
                       const std::vector<uint8>& data,
                       double timestamp);
 
   // From time-to-time, the browser incrementally informs us of how many bytes
   // it has successfully sent. This is part of our throttling process to avoid
   // sending too much data before knowing how much has already been sent.
@@ skipping 34 matching lines @@
   media::MidiPortInfoList outputs_;
 
   size_t unacknowledged_bytes_sent_;
 
   DISALLOW_COPY_AND_ASSIGN(MidiMessageFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MIDI_MESSAGE_FILTER_H_