Auto merge of #27487 - asajeffrey:webxr-update-webidl, r=Manishearth,jdm

WebXR Layers update WebIDL

<!-- Please describe your changes on the following line: -->

Updates the WebXR Layers WebIDL. Implements the "update the pending layers state" algorithm from the layer spec.

---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] There are updated tests for these changes

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tests/wpt/metadata/webxr/idlharness.https.window.js.ini

@@ -329,30 +329,6 @@
   [Stringification of xrInputSourceArray]
     expected: FAIL
 
-  [XRLayer interface: existence and properties of interface prototype object]
-    expected: FAIL
-
-  [XRLayer interface: existence and properties of interface object]
-    expected: FAIL
-
-  [XRLayer interface object name]
-    expected: FAIL
-
-  [XRLayer interface: existence and properties of interface prototype object's "constructor" property]
-    expected: FAIL
-
-  [XRWebGLLayer interface: existence and properties of interface object]
-    expected: FAIL
-
-  [XRWebGLLayer interface: existence and properties of interface prototype object]
-    expected: FAIL
-
-  [XRLayer interface object length]
-    expected: FAIL
-
-  [XRLayer interface: existence and properties of interface prototype object's @@unscopables property]
-    expected: FAIL
-
   [XRSession interface: xrSession must inherit property "cancelAnimationFrame(unsigned long)" with the proper type]
     expected: FAIL
 

tests/wpt/mozilla/meta/MANIFEST.json

@@ -13959,7 +13959,7 @@
      ]
     ],
     "interfaces.html": [
-     "d988b7939f83cef16a51a4ae5502ed029f31df99",
+     "b58b16ca333f9e00afade02c2ac60689ee7eef3a",
      [
       null,
       {}
@@ -14719,7 +14719,7 @@
      ]
     ],
     "layers.html": [
-     "49821d7661f92bc9cf22232d3fcb391c2cdc7295",
+     "f64cc1f30f469351b83cd1c12a0584b1db5317a7",
      [
       null,
       {}

tests/wpt/mozilla/tests/mozilla/interfaces.html

@@ -276,6 +276,7 @@ test_interfaces([
   "XRInputSource",
   "XRInputSourceArray",
   "XRInputSourceEvent",
+  "XRLayer",
   "XRPose",
   "XRReferenceSpace",
   "XRRay",

tests/wpt/mozilla/tests/webxr/layers.html

@@ -43,8 +43,8 @@
             });
             assert_equals(session.renderState.baseLayer, null, "Setting layers should unset baseLayer");
 
-            assert_throws_dom(
-              "InvalidStateError",
+            assert_throws_js(
+              TypeError,
               () => { session.updateRenderState({ layers: [layer], baseLayer: layer }); },
               "Setting both baseLayer and layers should fail"
             );