Introduce debug events for promises.

src/promise.js

Index: src/promise.js
diff --git a/src/promise.js b/src/promise.js
index 819074e62436a3724d3f07daa2561bd887e268ae..8214445c11a1e8e5f930aa31500e6c022724927e 100644
--- a/src/promise.js
+++ b/src/promise.js
@@ -38,6 +38,11 @@ var promiseRaw = GLOBAL_PRIVATE("Promise#raw");
     if (!IS_SPEC_FUNCTION(resolver))
       throw MakeTypeError('resolver_not_a_function', [resolver]);
     var promise = PromiseInit(this);
+    if (DEBUG_IS_ACTIVE) {
+      %DebugPromiseEvent({ type : "new Promise",
+                           promise: this,
+                           resolver: resolver });
+    }
     try {
       %DebugPromiseHandlePrologue(function() { return promise });
       resolver(function(x) { PromiseResolve(promise, x) },