import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/webidl/DOMRequest.webidl

@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum DOMRequestReadyState { "pending", "done" };
+
+[Exposed=(Window,Worker,System), NoInterfaceObject]
+interface DOMRequestShared {
+  readonly attribute DOMRequestReadyState readyState;
+
+  readonly attribute any result;
+  readonly attribute DOMError? error;
+
+  attribute EventHandler onsuccess;
+  attribute EventHandler onerror;
+};
+
+[Exposed=(Window,Worker,System)]
+interface DOMRequest : EventTarget {
+  // The [TreatNonCallableAsNull] annotation is required since then() should do
+  // nothing instead of throwing errors when non-callable arguments are passed.
+  // See documentation for Promise.then to see why we return "any".
+  [NewObject, Throws]
+  any then([TreatNonCallableAsNull] optional AnyCallback? fulfillCallback = null,
+           [TreatNonCallableAsNull] optional AnyCallback? rejectCallback = null);
+};
+
+DOMRequest implements DOMRequestShared;