net: Keep track of size of keep-alive records #56894
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These keep-alive records live on the
CoreResourceManagersince the vecof records must be modified by the fetch thread. The script thread sometimes
requires this information as well, which is why it can send a message to
obtain the total size.
The keep-alive records must be tracked per global. That's why all code needs
to specify the
pipeline_id. Requests optionally have this field, which is whythe code expects it to be present. The relevant information is added to the
navigator request to ensure it can compute it.
Fixes #41230
Reviewed in servo/servo#41457