[ABANDONED] Introduce Promise example implementation written in JavaScript.

Source/core/dom/Promise.idl

Index: Source/core/dom/Promise.idl
diff --git a/Source/modules/webmidi/MIDIConnectionEvent.idl b/Source/core/dom/Promise.idl
similarity index 87%
copy from Source/modules/webmidi/MIDIConnectionEvent.idl
copy to Source/core/dom/Promise.idl
index a9c745a2772afb04c1fb2083854cea7eac9dc082..4b3b1b0d2b5cb075ed800e4db9adaa7fff366f63 100644
--- a/Source/modules/webmidi/MIDIConnectionEvent.idl
+++ b/Source/core/dom/Promise.idl
@@ -29,8 +29,11 @@
  */
 
 [
-    EnabledAtRuntime=webMIDI,
-    ConstructorTemplate=Event
-] interface MIDIConnectionEvent : Event {
-    [InitializedByEventConstructor] readonly attribute MIDIPort port;
+   CustomConstructor(any init),
+   EnabledAtRuntime=promise
+] interface Promise {
+    // Example methods
+    [Custom] any get(any value);
+    [Custom] static any getStatic(any value);
+    [Custom] static any concat(any a, any b);
 };