script: Initialize all requests with clients (#41584)

In preparation for adding preload support for all requests, we need to
add relevant client information to all these entrypoints. Additionally,
for links we now also set the referrer correctly and initialize
documents. All of which are required to start loading preload
information when processing requests.

Part of #35035

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>
Co-authored-by: Josh Matthews <josh@joshmatthews.net>

components/script/dom/html/htmlmediaelement.rs

@@ -1433,6 +1433,7 @@ impl HTMLMediaElement {
             document.insecure_requests_policy(),
             document.has_trustworthy_ancestor_or_current_origin(),
             global.policy_container(),
+            global.request_client(),
         )
         .headers(headers)
         .origin(document.origin().immutable().clone())