Support Promises event-based instrumentation on backend.

Source/bindings/core/v8/DebuggerScript.js

Index: Source/bindings/core/v8/DebuggerScript.js
diff --git a/Source/bindings/core/v8/DebuggerScript.js b/Source/bindings/core/v8/DebuggerScript.js
index dc3405e1cc6361d45cabcb618dd92336719444fc..48d59f768f5a372b485e99b29627ce22affa6755 100644
--- a/Source/bindings/core/v8/DebuggerScript.js
+++ b/Source/bindings/core/v8/DebuggerScript.js
@@ -508,6 +508,15 @@ DebuggerScript._buildScopeObject = function(scopeType, scopeObject)
     return result;
 }
 
+DebuggerScript.getPromiseDetails = function(eventData)
+{
+    return {
+        "promise": eventData.promise().value(),
+        "parentPromise": eventData.parentPromise().value(),
+        "status": eventData.status()
+    };
+}
+
 // We never resolve Mirror by its handle so to avoid memory leaks caused by Mirrors in the cache we disable it.
 ToggleMirrorCache(false);