Support Promises event-based instrumentation on backend.

Source/bindings/core/v8/DebuggerScript.js

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 490 matching lines @@
     case ScopeType.With:
         result = scopeObject;
         break;
     case ScopeType.Block:
         // Unsupported yet. Mustn't be reachable.
         break;
     }
     return result;
 }
 
+DebuggerScript.getPromiseDetails = function(eventData)
+{
+    return {
+        "promise": eventData.promise().value(),
+        "parentPromise": eventData.parentPromise().value(),
+        "status": eventData.status(),
+        "value": eventData.value().value()
+    };
+}
+
 // We never resolve Mirror by its handle so to avoid memory leaks caused by Mirrors in the cache we disable it.
 ToggleMirrorCache(false);
 
 return DebuggerScript;
 })();