Expose promise value through promise mirror.

src/mirror-debugger.js

 // Copyright 2006-2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1198 matching lines @@
 
 
 PromiseMirror.prototype.status = function() {
   var status = %GetPromiseStatus(this.value_);
   if (status == 0) return "pending";
   if (status == 1) return "resolved";
   return "rejected";
 };
 
 
+PromiseMirror.prototype.promiseValue = function() {
+  return %GetPromiseValue(this.value_);
+};
+
+
 /**
  * Base mirror object for properties.
  * @param {ObjectMirror} mirror The mirror object having this property
  * @param {string} name The name of the property
  * @param {Array} details Details about the property
  * @constructor
  * @extends Mirror
  */
 function PropertyMirror(mirror, name, details) {
   %_CallFunction(this, PROPERTY_TYPE, Mirror);
@@ skipping 1297 matching lines @@
   }
 
   if (mirror.isDate()) {
     // Add date specific properties.
     content.value = mirror.value();
   }
 
   if (mirror.isPromise()) {
     // Add promise specific properties.
     content.status = mirror.status();
+    content.promiseValue = mirror.promiseValue();
   }
 
   // Add actual properties - named properties followed by indexed properties.
   var propertyNames = mirror.propertyNames(PropertyKind.Named);
   var propertyIndexes = mirror.propertyNames(PropertyKind.Indexed);
   var p = new Array(propertyNames.length + propertyIndexes.length);
   for (var i = 0; i < propertyNames.length; i++) {
     var propertyMirror = mirror.property(propertyNames[i]);
     p[i] = this.serializeProperty_(propertyMirror);
     if (details) {
@@ skipping 187 matching lines @@
   }
   if (!NUMBER_IS_FINITE(value)) {
     if (value > 0) {
       return 'Infinity';
     } else {
       return '-Infinity';
     }
   }
   return value;
 }