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/VTTRegion.webidl

@@ -0,0 +1,26 @@
+/* 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/webvtt/#the-vttregion-interface
+
+enum ScrollSetting { "" /* none */, "up"};
+
+[Pref="dom_webvtt_enabled", Exposed=Window]
+interface VTTRegion {
+  [Throws] constructor();
+  attribute DOMString id;
+  [SetterThrows]
+  attribute double width;
+  [SetterThrows]
+  attribute unsigned long lines;
+  [SetterThrows]
+  attribute double regionAnchorX;
+  [SetterThrows]
+  attribute double regionAnchorY;
+  [SetterThrows]
+  attribute double viewportAnchorX;
+  [SetterThrows]
+  attribute double viewportAnchorY;
+  attribute ScrollSetting scroll;
+};