Web MIDI: implement MIDIInput

Source/modules/webmidi/MIDIInput.idl

Index: Source/modules/webmidi/MIDIInput.idl
diff --git a/Source/modules/quota/StorageQuotaCallback.idl b/Source/modules/webmidi/MIDIInput.idl
similarity index 93%
copy from Source/modules/quota/StorageQuotaCallback.idl
copy to Source/modules/webmidi/MIDIInput.idl
index 8cd2df72a2034d4ec6642554f59c5834d0516216..125588d91e75ecc2306fa8ef3f5f4c4d1681d02c 100644
--- a/Source/modules/quota/StorageQuotaCallback.idl
+++ b/Source/modules/webmidi/MIDIInput.idl
@@ -28,6 +28,9 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-callback interface StorageQuotaCallback {
-    boolean handleEvent(unsigned long long grantedQuotaInBytes);
+[
+    ActiveDOMObject,
+    EventTarget
+] interface MIDIInput : MIDIPort {
+    attribute EventListener onmessage;

[Chris Rogers, 2013/04/26 19:55:39]

Chris Wilson has told me that the name should be "onmidimessage" and that he
will be updating the spec very soon, so we should use that name.

[Takashi Toyoshima, 2013/05/02 08:55:25]

Done.

 };