Web MIDI: make MidiManagerMac notify device connections

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 f7e1a8474a49172d1ab6a8a9a1c481449c9ebc3f..27d2df33596186351597eb64156e0b92fc8e4ba1 100644
--- a/content/renderer/media/midi_message_filter.h
+++ b/content/renderer/media/midi_message_filter.h
@@ -77,6 +77,12 @@ class CONTENT_EXPORT MidiMessageFilter : public IPC::MessageFilter {
   void OnAddInputPort(media::MidiPortInfo info);
   void OnAddOutputPort(media::MidiPortInfo info);
 
+  // These functions are called to notify the recipient that a device that is
+  // notified via OnAddInputPort() or OnAddOutputPort() gets disconnected, or
+  // connected again.
+  void OnSetInputPortState(uint32 port, bool connected);
+  void OnSetOutputPortState(uint32 port, bool connected);
+
   // Called when the browser process has sent MIDI data containing one or
   // more messages.
   void OnDataReceived(uint32 port,
@@ -93,6 +99,8 @@ class CONTENT_EXPORT MidiMessageFilter : public IPC::MessageFilter {
 
   void HandleAddInputPort(media::MidiPortInfo info);
   void HandleAddOutputPort(media::MidiPortInfo info);
+  void HandleSetInputPortState(uint32 port, bool connected);
+  void HandleSetOutputPortState(uint32 port, bool connected);
 
   void HandleDataReceived(uint32 port,
                           const std::vector<uint8>& data,