Web MIDI: make MidiManagerMac notify device connections

media/midi/midi_manager_unittest.cc

Index: media/midi/midi_manager_unittest.cc
diff --git a/media/midi/midi_manager_unittest.cc b/media/midi/midi_manager_unittest.cc
index 8662adb5a997778e3c06c84258c704ec56979ca9..dd4448ba8bfd9b535b9e0dc9ecd34f71ee4f619f 100644
--- a/media/midi/midi_manager_unittest.cc
+++ b/media/midi/midi_manager_unittest.cc
@@ -62,6 +62,8 @@ class FakeMidiManagerClient : public MidiManagerClient {
   // MidiManagerClient implementation.
   void AddInputPort(const MidiPortInfo& info) override {}
   void AddOutputPort(const MidiPortInfo& info) override {}
+  void SetInputPortState(uint32 port_index, bool connected) override {}
+  void SetOutputPortState(uint32 port_index, bool connected) override {}
 
   void CompleteStartSession(MidiResult result) override {
     EXPECT_TRUE(wait_for_result_);