Web MIDI: implement implicit open() on send() and setOnmidimessage()

LayoutTests/webmidi/implicit-open-expected.txt

Index: LayoutTests/webmidi/implicit-open-expected.txt
diff --git a/LayoutTests/webmidi/implicit-open-expected.txt b/LayoutTests/webmidi/implicit-open-expected.txt
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+Tests MIDIPort implicit open.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS requestMIDIAccess() succeeded with access [object MIDIAccess].
+Check state transition for midimessage on closed state.
+- check initial state.
+PASS port.connection is "closed"
+- check port handler.
+PASS handler is called with port [object MIDIInput].
+PASS eventport.id is "MockInputID"
+PASS eventport.connection is "open"
+- check access handler.
+PASS handler is called with port [object MIDIInput].
+PASS eventport.id is "MockInputID"
+PASS eventport.connection is "open"
+- check final state.
+PASS port.connection is "open"
+Check state transition for send on closed state.
+- check initial state.
+PASS port.connection is "closed"
+- check port handler.
+PASS handler is called with port [object MIDIOutput].
+PASS eventport.id is "MockOutputID"
+PASS eventport.connection is "open"
+- check access handler.
+PASS handler is called with port [object MIDIOutput].
+PASS eventport.id is "MockOutputID"
+PASS eventport.connection is "open"
+- check final state.
+PASS port.connection is "open"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+