Read internal properties [[PromiseStatus]] and [[PromiseValue]] of the promise.

src/mirror-debugger.js

Index: src/mirror-debugger.js
diff --git a/src/mirror-debugger.js b/src/mirror-debugger.js
index fde3f10f3f181e5adc75e56024133ef3cc35fc02..b140343f4858086237783e96755c955d1daecfc5 100644
--- a/src/mirror-debugger.js
+++ b/src/mirror-debugger.js
@@ -798,7 +798,8 @@ ObjectMirror.prototype.toText = function() {
 
 /**
  * Return the internal properties of the value, such as [[PrimitiveValue]] of
- * scalar wrapper objects and properties of the bound function.
+ * scalar wrapper objects, properties of the bound function and properties of
+ * the promise.
  * This method is done static to be accessible from Debug API with the bare
  * values without mirrors.
  * @return {Array} array (possibly empty) of InternalProperty instances
@@ -822,6 +823,14 @@ ObjectMirror.GetInternalProperties = function(value) {
       result.push(new InternalPropertyMirror("[[BoundArgs]]", boundArgs));
     }
     return result;
+  } else if (ObjectIsPromise(value)) {
+      var mirror = new PromiseMirror(value);
+      var result = [];
+      result.push(new InternalPropertyMirror("[[PromiseStatus]]",
+                                             mirror.status()));
+      result.push(new InternalPropertyMirror("[[PromiseValue]]",
+                                             mirror.promiseValue()));
+      return result;
   }
   return [];
 }