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

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index a11b072377d0b941d57e934a8f4476d7874dbfba..f8f927c08de6e01d90238a8bafb66557a00767e3 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -150,11 +150,13 @@ void HeapObject::HeapObjectPrint(std::ostream& os) {  // NOLINT
     case JS_SPECIAL_API_OBJECT_TYPE:
     case JS_CONTEXT_EXTENSION_OBJECT_TYPE:
     case JS_GENERATOR_OBJECT_TYPE:
-    case JS_PROMISE_TYPE:
     case JS_ARGUMENTS_TYPE:
     case JS_ERROR_TYPE:
       JSObject::cast(this)->JSObjectPrint(os);
       break;
+    case JS_PROMISE_TYPE:
+      JSPromise::cast(this)->JSPromisePrint(os);
+      break;
     case JS_ARRAY_TYPE:
       JSArray::cast(this)->JSArrayPrint(os);
       break;
@@ -542,6 +544,14 @@ void JSArray::JSArrayPrint(std::ostream& os) {  // NOLINT
   JSObjectPrintBody(os, this);
 }
 
+void JSPromise::JSPromisePrint(std::ostream& os) {  // NOLINT
+  JSObjectPrintHeader(os, this, "JSPromise");
+  os << "\n - status = " << JSPromise::Status(status());
+  os << "\n - result = " << Brief(result());
+  os << "\n - deferreds = " << Brief(deferred());
+  os << "\n - fulfill_reactions = " << Brief(fulfill_reactions());
+  os << "\n - reject_reactions = " << Brief(reject_reactions());
+}
 
 void JSRegExp::JSRegExpPrint(std::ostream& os) {  // NOLINT
   JSObjectPrintHeader(os, this, "JSRegExp");