[promises] Move async debug event creation to c++

src/debug/debug.h

Index: src/debug/debug.h
diff --git a/src/debug/debug.h b/src/debug/debug.h
index 33e4f15c5c13bb22fe6043830637281a6c29bc50..e436738fb41573429d70b1533fa2cb03290ab6f2 100644
--- a/src/debug/debug.h
+++ b/src/debug/debug.h
@@ -417,7 +417,8 @@ class Debug {
   void OnCompileError(Handle<Script> script);
   void OnBeforeCompile(Handle<Script> script);
   void OnAfterCompile(Handle<Script> script);
-  void OnAsyncTaskEvent(Handle<JSObject> data);
+  void OnAsyncTaskEvent(Handle<String> type, Handle<Object> id,
+                        Handle<String> name);
 
   // API facing.
   void SetEventListener(Handle<Object> callback, Handle<Object> data);
@@ -588,8 +589,9 @@ class Debug {
       Handle<Object> promise);
   MUST_USE_RESULT MaybeHandle<Object> MakeCompileEvent(
       Handle<Script> script, v8::DebugEvent type);
-  MUST_USE_RESULT MaybeHandle<Object> MakeAsyncTaskEvent(
-      Handle<JSObject> task_event);
+  MUST_USE_RESULT MaybeHandle<Object> MakeAsyncTaskEvent(Handle<String> type,
+                                                         Handle<Object> id,
+                                                         Handle<String> name);
 
   // Mirror cache handling.
   void ClearMirrorCache();