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I9329573da7d4f2af60515ef32b3b64bb769e3755 calls a hook for extensions to state whether the user exists on both the global and current wiki.

function onLoadGlobalCssJs( User $user, $global, $current ) {
$caUser = CentralAuthUser::getInstance( $user );
return $caUser->attachedOn( $global ) && $caUser->attachedOn( $current );
}

...or something like that.

Change 98751 had a related patch set uploaded by Legoktm:
Add hook handler for GlobalCssJs

https://gerrit.wikimedia.org/r/98751

Change 98751 merged by jenkins-bot:
Add hook handler for GlobalCssJs

https://gerrit.wikimedia.org/r/98751