Introduce more debug events for promises.

src/debug-debugger.js

Index: src/debug-debugger.js
diff --git a/src/debug-debugger.js b/src/debug-debugger.js
index 3a35c98427506fe2bf8b0f980aeca566338b9a44..78f3396a3da141754eddd76def962b5dd2249ab5 100644
--- a/src/debug-debugger.js
+++ b/src/debug-debugger.js
@@ -1202,9 +1202,15 @@ function MakeScriptObject_(script, include_source) {
 
 
 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);
+  }
 }
 
 
@@ -1227,6 +1233,40 @@ NewPromiseEvent.prototype.resolver = function() {
 }
 
 
+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);
 }