Web MIDI: implement MIDIOutput

Source/modules/webmidi/MIDIOutput.idl

Index: Source/modules/webmidi/MIDIOutput.idl
diff --git a/Source/core/html/ime/Composition.idl b/Source/modules/webmidi/MIDIOutput.idl
similarity index 89%
copy from Source/core/html/ime/Composition.idl
copy to Source/modules/webmidi/MIDIOutput.idl
index b873f1b2fe22566cc51dad8d478e77a8665912ab..a07ec6fccf0bcd3a4f1d69f4912ac9be3a8f2c10 100644
--- a/Source/core/html/ime/Composition.idl
+++ b/Source/modules/webmidi/MIDIOutput.idl
@@ -28,11 +28,9 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-// http://www.w3.org/TR/ime-api/
 [
-    NoInterfaceObject,
-    ImplementationLacksVTable
-] interface Composition {
-    readonly attribute Node text;
-    readonly attribute Range caret;
+    NoInterfaceObject
+] interface MIDIOutput : MIDIPort {
+    void send(Uint8Array data, optional double timestamp);
+    void send(sequence<unsigned long> data, optional double timestamp);
 };