Stub out Trusted Types interfaces (#36355)

Some methods are implemented fully, while others are implemented
partly. With these implementations, there are no observed crashes
when running the trusted-types web-platform-tests.

Most notably, the tests/wpt/tests/trusted-types/idlharness.window.js
is now fully passing.

Part of #36258

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

components/script/dom/trustedscripturl.rs

@@ -0,0 +1,45 @@
+/* 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/. */
+
+use dom_struct::dom_struct;
+
+use crate::dom::bindings::codegen::Bindings::TrustedScriptURLBinding::TrustedScriptURLMethods;
+use crate::dom::bindings::reflector::{Reflector, reflect_dom_object};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::bindings::str::DOMString;
+use crate::dom::globalscope::GlobalScope;
+use crate::script_runtime::CanGc;
+
+#[dom_struct]
+pub struct TrustedScriptURL {
+    reflector_: Reflector,
+
+    data: String,
+}
+
+impl TrustedScriptURL {
+    fn new_inherited(data: String) -> Self {
+        Self {
+            reflector_: Reflector::new(),
+            data,
+        }
+    }
+
+    #[cfg_attr(crown, allow(crown::unrooted_must_root))]
+    pub(crate) fn new(data: String, global: &GlobalScope, can_gc: CanGc) -> DomRoot<Self> {
+        reflect_dom_object(Box::new(Self::new_inherited(data)), global, can_gc)
+    }
+}
+
+impl TrustedScriptURLMethods<crate::DomTypeHolder> for TrustedScriptURL {
+    /// <https://www.w3.org/TR/trusted-types/#trustedscripturl-stringification-behavior>
+    fn Stringifier(&self) -> DOMString {
+        DOMString::from(&*self.data)
+    }
+
+    /// <https://www.w3.org/TR/trusted-types/#dom-trustedscripturl-tojson>
+    fn ToJSON(&self) -> DOMString {
+        DOMString::from(&*self.data)
+    }
+}