The Worklet spec defines the referrer policy as follows:
"5. Let inheritedReferrerPolicy be outsideSettings's referrer policy."
https://drafts.css-houdini.org/worklets/#script-settings-for-worklets
However, our current impl sets the referrer policy to an empty String. There is a TODO comment about it in ThreadedWorkletMessagingProxy::Initialize().
"// TODO(ikilpatrick): Decide on sensible a value for referrerPolicy."
Comment 1 by bugdroid1@chromium.org
, Oct 24 2017