Reland Create JSPromise (patchset #16 id:300001 of https://codereview.chromium.org/2536463002/ )"

src/debug/mirrors.js

Index: src/debug/mirrors.js
diff --git a/src/debug/mirrors.js b/src/debug/mirrors.js
index edc6af5e5820b855ca19f72d03e2cdbb8b4efd3d..689235b151b351a2be160f564f5503964dbc57af 100644
--- a/src/debug/mirrors.js
+++ b/src/debug/mirrors.js
@@ -13,8 +13,6 @@ var IsNaN = global.isNaN;
 var JSONStringify = global.JSON.stringify;
 var MapEntries;
 var MapIteratorNext;
-var promiseStateSymbol = utils.ImportNow("promise_state_symbol");
-var promiseResultSymbol = utils.ImportNow("promise_result_symbol");
 var SetIteratorNext;
 var SetValues;
 
@@ -1267,7 +1265,7 @@ inherits(PromiseMirror, ObjectMirror);
 
 
 function PromiseGetStatus_(value) {
-  var status = %DebugGetProperty(value, promiseStateSymbol);
+  var status = %PromiseStatus(value);
   if (status == 0) return "pending";
   if (status == 1) return "resolved";
   return "rejected";
@@ -1275,7 +1273,7 @@ function PromiseGetStatus_(value) {
 
 
 function PromiseGetValue_(value) {
-  return %DebugGetProperty(value, promiseResultSymbol);
+  return %PromiseResult(value);
 }