Introduce RTCError and RTCErrorEvent

components/script/dom/webidls/RTCErrorEvent.webidl

@@ -0,0 +1,15 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+ // https://www.w3.org/TR/webrtc/#rtcerrorevent-interface
+
+[Exposed=Window]
+interface RTCErrorEvent : Event {
+  constructor(DOMString type, RTCErrorEventInit eventInitDict);
+  [SameObject] readonly attribute RTCError error;
+};
+
+dictionary RTCErrorEventInit : EventInit {
+  required RTCError error;
+};