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

src/debug/debug.cc

Index: src/debug/debug.cc
diff --git a/src/debug/debug.cc b/src/debug/debug.cc
index 93fdd58273198aeec30cc8b0d42a35ae40e4b787..cedfbab85d5406553092c5160d452adaed7ef524 100644
--- a/src/debug/debug.cc
+++ b/src/debug/debug.cc
@@ -1658,10 +1658,12 @@ MaybeHandle<Object> Debug::MakeCompileEvent(Handle<Script> script,
   return CallFunction("MakeCompileEvent", arraysize(argv), argv);
 }
 
-
-MaybeHandle<Object> Debug::MakeAsyncTaskEvent(Handle<JSObject> task_event) {
+MaybeHandle<Object> Debug::MakeAsyncTaskEvent(Handle<String> type,
+                                              Handle<Object> id,
+                                              Handle<String> name) {
+  DCHECK(id->IsNumber());
   // Create the async task event object.
-  Handle<Object> argv[] = { task_event };
+  Handle<Object> argv[] = {type, id, name};
   return CallFunction("MakeAsyncTaskEvent", arraysize(argv), argv);
 }
 
@@ -1781,8 +1783,9 @@ void Debug::OnAfterCompile(Handle<Script> script) {
   ProcessCompileEvent(v8::AfterCompile, script);
 }
 
-
-void Debug::OnAsyncTaskEvent(Handle<JSObject> data) {
+void Debug::OnAsyncTaskEvent(Handle<String> type, Handle<Object> id,
+                             Handle<String> name) {
+  DCHECK(id->IsNumber());
   if (in_debug_scope() || ignore_events()) return;
 
   HandleScope scope(isolate_);
@@ -1792,7 +1795,7 @@ void Debug::OnAsyncTaskEvent(Handle<JSObject> data) {
   // Create the script collected state object.
   Handle<Object> event_data;
   // Bail out and don't call debugger if exception.
-  if (!MakeAsyncTaskEvent(data).ToHandle(&event_data)) return;
+  if (!MakeAsyncTaskEvent(type, id, name).ToHandle(&event_data)) return;
 
   // Process debug event.
   ProcessDebugEvent(v8::AsyncTaskEvent,