[inspector] async stacks for Promise.then calls...

src/js/promise.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils, extrasUtils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 21 matching lines @@
 
 utils.Import(function(from) {
   ObjectHasOwnProperty = from.ObjectHasOwnProperty;
   SpeciesConstructor = from.SpeciesConstructor;
 });
 
 // -------------------------------------------------------------------
 
 // Core functionality.
 
-function PromiseDebugGetInfo(deferreds, status) {
-  var id, name, instrumenting = DEBUG_IS_ACTIVE;
-
+function PromiseDebugGetInfo(deferreds, status, id) {
+  var name, instrumenting = DEBUG_IS_ACTIVE;
   if (instrumenting) {
     // In an async function, reuse the existing stack related to the outer
     // Promise. Otherwise, e.g. in a direct call to then, save a new stack.
     // Promises with multiple reactions with one or more of them being async
     // functions will not get a good stack trace, as async functions require
     // different stacks from direct Promise use, but we save and restore a
     // stack once for all reactions. TODO(littledan): Improve this case.
     if (!IS_UNDEFINED(deferreds) &&
         HAS_PRIVATE(deferreds.promise, promiseHandledBySymbol) &&
         HAS_PRIVATE(GET_PRIVATE(deferreds.promise, promiseHandledBySymbol),
                     promiseAsyncStackIDSymbol)) {
       id = GET_PRIVATE(GET_PRIVATE(deferreds.promise, promiseHandledBySymbol),
                        promiseAsyncStackIDSymbol);
       name = "async function";
     } else {
-      id = %DebugNextMicrotaskId();
       name = status === kFulfilled ? "Promise.resolve" : "Promise.reject";
-      %DebugAsyncTaskEvent("enqueue", id, name);
     }
   }
   return [id, name];
 }
 
 function PromiseIdResolveHandler(x) { return x; }
 function PromiseIdRejectHandler(r) { %_ReThrow(r); }
 SET_PRIVATE(PromiseIdRejectHandler, promiseForwardingHandlerSymbol, true);
 
 // -------------------------------------------------------------------
@@ skipping 314 matching lines @@
 
 utils.Export(function(to) {
   to.PromiseCreate = PromiseCreate;
   to.PromiseThen = PromiseThen;
 
   to.CreateInternalPromiseCapability = CreateInternalPromiseCapability;
   to.RejectPromise = RejectPromise;
 });
 
 })