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/CSSKeyframesRule.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://drafts.csswg.org/css-animations/#interface-csskeyframesrule
+[Exposed=Window]
+interface CSSKeyframesRule : CSSRule {
+  [SetterThrows]
+           attribute DOMString   name;
+  readonly attribute CSSRuleList cssRules;
+
+  undefined            appendRule(DOMString rule);
+  undefined            deleteRule(DOMString select);
+  CSSKeyframeRule? findRule(DOMString select);
+};