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/xrwebglsubimage.rs

@@ -0,0 +1,49 @@
+/* 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 euclid::Size2D;
+use webxr_api::Viewport;
+
+use crate::dom::bindings::codegen::Bindings::XRWebGLSubImageBinding::XRWebGLSubImage_Binding::XRWebGLSubImageMethods;
+use crate::dom::bindings::root::{Dom, DomRoot};
+use crate::dom::webgltexture::WebGLTexture;
+use crate::dom::xrsubimage::XRSubImage;
+
+#[dom_struct]
+pub struct XRWebGLSubImage {
+    xr_sub_image: XRSubImage,
+    color_texture: Dom<WebGLTexture>,
+    depth_stencil_texture: Option<Dom<WebGLTexture>>,
+    image_index: Option<u32>,
+    #[no_trace]
+    size: Size2D<u32, Viewport>,
+}
+
+impl XRWebGLSubImageMethods<crate::DomTypeHolder> for XRWebGLSubImage {
+    /// <https://immersive-web.github.io/layers/#dom-xrwebglsubimage-colortexture>
+    fn ColorTexture(&self) -> DomRoot<WebGLTexture> {
+        DomRoot::from_ref(&self.color_texture)
+    }
+
+    /// <https://immersive-web.github.io/layers/#dom-xrwebglsubimage-depthstenciltexture>
+    fn GetDepthStencilTexture(&self) -> Option<DomRoot<WebGLTexture>> {
+        self.depth_stencil_texture.as_deref().map(DomRoot::from_ref)
+    }
+
+    /// <https://immersive-web.github.io/layers/#dom-xrwebglsubimage-imageindex>
+    fn GetImageIndex(&self) -> Option<u32> {
+        self.image_index
+    }
+
+    /// <https://immersive-web.github.io/layers/#dom-xrwebglsubimage-texturewidth>
+    fn TextureWidth(&self) -> u32 {
+        self.size.width
+    }
+
+    /// <https://immersive-web.github.io/layers/#dom-xrwebglsubimage-textureheight>
+    fn TextureHeight(&self) -> u32 {
+        self.size.height
+    }
+}