Web MIDI: distributes MIDIPort information asynchronously

content/renderer/media/midi_message_filter.h

Index: content/renderer/media/midi_message_filter.h
diff --git a/content/renderer/media/midi_message_filter.h b/content/renderer/media/midi_message_filter.h
index b7678eeceb287f5d09fe3f66e6d2fdb65558a68a..84b3c25b0d0406dc65e5787c07bab86633b7d982 100644
--- a/content/renderer/media/midi_message_filter.h
+++ b/content/renderer/media/midi_message_filter.h
@@ -68,11 +68,13 @@ class CONTENT_EXPORT MidiMessageFilter : public IPC::MessageFilter {
 
   // 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.