Web MIDI: add open() and close() to MIDIPort

Source/modules/webmidi/MIDIOutput.h

Index: Source/modules/webmidi/MIDIOutput.h
diff --git a/Source/modules/webmidi/MIDIOutput.h b/Source/modules/webmidi/MIDIOutput.h
index a8a60c1935842caf0aefb16c6ee73368efe7406a..26e73ed3dce4677aff5e0c5758404b83bf3aee54 100644
--- a/Source/modules/webmidi/MIDIOutput.h
+++ b/Source/modules/webmidi/MIDIOutput.h
@@ -42,8 +42,8 @@ class MIDIAccess;
 class MIDIOutput final : public MIDIPort {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static MIDIOutput* create(MIDIAccess*, unsigned portIndex, const String& id, const String& manufacturer, const String& name, const String& version, bool isActive);
-    virtual ~MIDIOutput();
+    static MIDIOutput* create(MIDIAccess*, unsigned portIndex, const String& id, const String& manufacturer, const String& name, const String& version, MIDIAccessor::MIDIPortState);
+    ~MIDIOutput() override;
 
     void send(DOMUint8Array*, double timestamp, ExceptionState&);
     void send(Vector<unsigned>, double timestamp, ExceptionState&);
@@ -55,7 +55,7 @@ public:
     DECLARE_VIRTUAL_TRACE();
 
 private:
-    MIDIOutput(MIDIAccess*, unsigned portIndex, const String& id, const String& manufacturer, const String& name, const String& version, bool isActive);
+    MIDIOutput(MIDIAccess*, unsigned portIndex, const String& id, const String& manufacturer, const String& name, const String& version, MIDIAccessor::MIDIPortState);
 
     unsigned m_portIndex;
 };