Merge webxr repository (#35228)

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

components/webxr/openxr/graphics.rs

@@ -0,0 +1,25 @@
+use euclid::{Size2D, UnknownUnit};
+use openxr::{ExtensionSet, FrameStream, FrameWaiter, Graphics, Instance, Session, SystemId};
+use surfman::Context as SurfmanContext;
+use surfman::Device as SurfmanDevice;
+use surfman::Error as SurfmanError;
+use surfman::SurfaceTexture;
+use webxr_api::Error;
+
+pub enum GraphicsProvider {}
+
+pub trait GraphicsProviderMethods<G: Graphics> {
+    fn enable_graphics_extensions(exts: &mut ExtensionSet);
+    fn pick_format(formats: &[u32]) -> u32;
+    fn create_session(
+        device: &SurfmanDevice,
+        instance: &Instance,
+        system: SystemId,
+    ) -> Result<(Session<G>, FrameWaiter, FrameStream<G>), Error>;
+    fn surface_texture_from_swapchain_texture(
+        image: <G as Graphics>::SwapchainImage,
+        device: &mut SurfmanDevice,
+        context: &mut SurfmanContext,
+        size: &Size2D<i32, UnknownUnit>,
+    ) -> Result<SurfaceTexture, SurfmanError>;
+}