Web MIDI: implement MIDIConnectionEvent

LayoutTests/fast/events/constructors/midi-connection-event-constructor-expected.txt

Index: LayoutTests/fast/events/constructors/midi-connection-event-constructor-expected.txt
diff --git a/LayoutTests/fast/events/constructors/midi-connection-event-constructor-expected.txt b/LayoutTests/fast/events/constructors/midi-connection-event-constructor-expected.txt
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+This tests the constructor for the MIDIConnectionEvent DOM class.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS new MIDIConnectionEvent('eventType').bubbles is false
+PASS new MIDIConnectionEvent('eventType').cancelable is false
+PASS new MIDIConnectionEvent('eventType').port is null
+PASS new MIDIConnectionEvent('eventType', { bubbles: false }).bubbles is false
+PASS new MIDIConnectionEvent('eventType', { bubbles: true }).bubbles is true
+PASS new MIDIConnectionEvent('eventType', { cancelable: false }).cancelable is false
+PASS new MIDIConnectionEvent('eventType', { cancelable: true }).cancelable is true
+PASS new MIDIConnectionEvent('eventType', { bubbles: true, cancelable: true }).bubbles is true
+PASS new MIDIConnectionEvent('eventType', { bubbles: true, cancelable: true }).cancelable is true
+PASS successfullyParsed is true
+
+TEST COMPLETE
+