script: Move code generation and webidl files to new script_bindings crate. (#35157)

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

components/script_bindings/webidls/RTCDataChannelEvent.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://w3c.github.io/webrtc-pc/#dom-rtcdatachannelevent
+
+[Exposed=Window, Pref="dom_webrtc_enabled"]
+interface RTCDataChannelEvent : Event {
+  constructor(DOMString type, RTCDataChannelEventInit eventInitDict);
+  readonly attribute RTCDataChannel channel;
+};
+
+dictionary RTCDataChannelEventInit : EventInit {
+  required RTCDataChannel channel;
+};