Introduce more debug events for promises.

src/debug-debugger.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.
 
 // Default number of frames to include in the response to backtrace request.
 var kDefaultBacktraceLength = 10;
 
 var Debug = {};
 
 // Regular expression to skip "crud" at the beginning of a source line which is
@@ skipping 1184 matching lines @@
     o.data = script.data();
   }
   if (include_source) {
     o.source = script.source();
   }
   return o;
 }
 
 
 function MakePromiseEvent(event_data) {
-  if (event_data.type = "new Promise") {
+  if (event_data.type == "new") {
     return new NewPromiseEvent(event_data);
   }
+  if (event_data.type == "update") {
+    return new UpdatePromiseStatusEvent(event_data);
+  }
+  if (event_data.type == "chain") {
+    return new UpdatePromiseParentEvent(event_data);
+  }
 }
 
 
 function PromiseGetter() {
   return MakeMirror(this.promise_);
 }
 
 
 function NewPromiseEvent(event_data) {
   this.resolver_ = event_data.resolver;
   this.promise_ = event_data.promise;
 }
 
 
 NewPromiseEvent.prototype.promise = PromiseGetter;
 
 
 NewPromiseEvent.prototype.resolver = function() {
   return MakeMirror(this.resolver_);
 }
 
 
+function UpdatePromiseStatusEvent(event_data) {
+  this.promise_ = event_data.promise;
+  this.status_ = event_data.status;
+  this.value_ = event_data.value;
+}
+
+
+UpdatePromiseStatusEvent.prototype.promise = PromiseGetter;
+
+
+UpdatePromiseStatusEvent.prototype.status = function() {
+  return this.status_;
+}
+
+
+UpdatePromiseStatusEvent.prototype.value = function() {
+  return MakeMirror(this.value_);
+}
+
+
+function UpdatePromiseParentEvent(event_data) {
+  this.promise_ = event_data.promise;
+  this.parentPromise_ = event_data.parentPromise;
+}
+
+
+UpdatePromiseParentEvent.prototype.promise = PromiseGetter;
+
+
+UpdatePromiseParentEvent.prototype.parentPromise = function() {
+  return MakeMirror(this.parentPromise_);
+}
+
+
 function MakeAsyncTaskEvent(event_data) {
   return new AsyncTaskEvent(event_data);
 }
 
 
 function AsyncTaskEvent(event_data) {
   this.type_ = event_data.type;
   this.name_ = event_data.name;
   this.id_ = event_data.id;
 }
@@ skipping 1328 matching lines @@
 
     default:
       json = null;
   }
   return json;
 }
 
 Debug.TestApi = {
   CommandProcessorResolveValue: DebugCommandProcessor.resolveValue_
 };