[ABANDONED] Implement Promises.

Source/core/dom/Promise.idl

Index: Source/core/dom/Promise.idl
diff --git a/Source/modules/webmidi/MIDIMessageEvent.idl b/Source/core/dom/Promise.idl
similarity index 75%
copy from Source/modules/webmidi/MIDIMessageEvent.idl
copy to Source/core/dom/Promise.idl
index fe64536571a2ae96486eec838ea007ba0f2edf3b..565ae38542eb31cc77050f551f8f209785f68770 100644
--- a/Source/modules/webmidi/MIDIMessageEvent.idl
+++ b/Source/core/dom/Promise.idl
@@ -28,12 +28,17 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-// FIXME: The spec doesn't provide details about constructor, yet.
-// See also, https://github.com/WebAudio/web-midi-api/issues/1 .
 [
-    EnabledAtRuntime=webMIDI,
-    ConstructorTemplate=Event
-] interface MIDIMessageEvent : Event {
-    [InitializedByEventConstructor] readonly attribute double receivedTime;
-    [InitializedByEventConstructor] readonly attribute Uint8Array data;
+   CustomConstructor(any init),
+   EnabledAtRuntime=promise
+] interface Promise {
+    [Custom] static Promise fulfill(any value);
+    [Custom] static Promise resolve(any value);
+    [Custom] static Promise reject(any value);
+    [Custom] static Promise any(any... values); 
+    [Custom] static Promise every(any... values);
+    [Custom] static Promise some(any... values);
+
+    [Custom] Promise then(AnyCallback acceptCallback, AnyCallback rejectCallback);
+    [Custom] Promise catch(AnyCallback rejectCallback);
 };