Filter out webidl files based on special comments, and feature-gate webxr interfaces. (#34348)

* Filter out webidl files based on skip-if directives.

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

* script: Don't build XR functionality without webxr feature.

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

* Fix tidy.

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

* script: Adjust imports for file movement.

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

* Fix clippy.

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

* Formatting.

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

* Clean up webxr module import.

Co-authored-by: Samson <16504129+sagudev@users.noreply.github.com>
Signed-off-by: Josh Matthews <josh@joshmatthews.net>

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
Co-authored-by: Samson <16504129+sagudev@users.noreply.github.com>

components/script/dom/webxr/xrmediabinding.rs

@@ -0,0 +1,101 @@
+/* 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 js::rust::HandleObject;
+
+use crate::dom::bindings::codegen::Bindings::XRMediaBindingBinding::XRMediaBinding_Binding::XRMediaBindingMethods;
+use crate::dom::bindings::codegen::Bindings::XRMediaBindingBinding::XRMediaLayerInit;
+use crate::dom::bindings::error::{Error, Fallible};
+use crate::dom::bindings::reflector::{reflect_dom_object_with_proto, Reflector};
+use crate::dom::bindings::root::{Dom, DomRoot};
+use crate::dom::htmlvideoelement::HTMLVideoElement;
+use crate::dom::window::Window;
+use crate::dom::xrcylinderlayer::XRCylinderLayer;
+use crate::dom::xrequirectlayer::XREquirectLayer;
+use crate::dom::xrquadlayer::XRQuadLayer;
+use crate::dom::xrsession::XRSession;
+use crate::script_runtime::CanGc;
+
+#[dom_struct]
+pub struct XRMediaBinding {
+    reflector: Reflector,
+    session: Dom<XRSession>,
+}
+
+impl XRMediaBinding {
+    pub fn new_inherited(session: &XRSession) -> XRMediaBinding {
+        XRMediaBinding {
+            reflector: Reflector::new(),
+            session: Dom::from_ref(session),
+        }
+    }
+
+    fn new(
+        global: &Window,
+        proto: Option<HandleObject>,
+        session: &XRSession,
+        can_gc: CanGc,
+    ) -> DomRoot<XRMediaBinding> {
+        reflect_dom_object_with_proto(
+            Box::new(XRMediaBinding::new_inherited(session)),
+            global,
+            proto,
+            can_gc,
+        )
+    }
+}
+
+impl XRMediaBindingMethods<crate::DomTypeHolder> for XRMediaBinding {
+    /// <https://immersive-web.github.io/layers/#dom-xrmediabinding-xrmediabinding>
+    fn Constructor(
+        global: &Window,
+        proto: Option<HandleObject>,
+        can_gc: CanGc,
+        session: &XRSession,
+    ) -> Fallible<DomRoot<XRMediaBinding>> {
+        // Step 1.
+        if session.is_ended() {
+            return Err(Error::InvalidState);
+        }
+
+        // Step 2.
+        if !session.is_immersive() {
+            return Err(Error::InvalidState);
+        }
+
+        // Steps 3-5.
+        Ok(XRMediaBinding::new(global, proto, session, can_gc))
+    }
+
+    /// <https://immersive-web.github.io/layers/#dom-xrmediabinding-createquadlayer>
+    fn CreateQuadLayer(
+        &self,
+        _: &HTMLVideoElement,
+        _: &XRMediaLayerInit,
+    ) -> Fallible<DomRoot<XRQuadLayer>> {
+        // https://github.com/servo/servo/issues/27493
+        Err(Error::NotSupported)
+    }
+
+    /// <https://immersive-web.github.io/layers/#dom-xrmediabinding-createcylinderlayer>
+    fn CreateCylinderLayer(
+        &self,
+        _: &HTMLVideoElement,
+        _: &XRMediaLayerInit,
+    ) -> Fallible<DomRoot<XRCylinderLayer>> {
+        // https://github.com/servo/servo/issues/27493
+        Err(Error::NotSupported)
+    }
+
+    /// <https://immersive-web.github.io/layers/#dom-xrmediabinding-createequirectlayer>
+    fn CreateEquirectLayer(
+        &self,
+        _: &HTMLVideoElement,
+        _: &XRMediaLayerInit,
+    ) -> Fallible<DomRoot<XREquirectLayer>> {
+        // https://github.com/servo/servo/issues/27493
+        Err(Error::NotSupported)
+    }
+}