Add top-level creation URL for global scope (#37342)

Global scopes have two creation URLs: one for itself and one for the
"top-level" scope. It's not immediately obvious what is considered
top-level here (it is not strictly defined in the specification).

In any case, reports need the creation URL of the scope itself, not the
top-level version. Therefore, propagate this information from all
scopes, where the worker and worklets remain to pass in `None` for their
top-level scope.

Part of #37328

---------

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

components/script/dom/window.rs

@@ -3052,7 +3052,8 @@ impl Window {
         parent_info: Option<PipelineId>,
         viewport_details: ViewportDetails,
         origin: MutableOrigin,
-        creator_url: ServoUrl,
+        creation_url: ServoUrl,
+        top_level_creation_url: ServoUrl,
         navigation_start: CrossProcessInstant,
         webgl_chan: Option<WebGLChan>,
         #[cfg(feature = "webxr")] webxr_registry: Option<webxr_api::Registry>,
@@ -3088,7 +3089,8 @@ impl Window {
                 constellation_chan,
                 resource_threads,
                 origin,
-                Some(creator_url),
+                creation_url,
+                Some(top_level_creation_url),
                 microtask_queue,
                 #[cfg(feature = "webgpu")]
                 gpu_id_hub,