If I'm not mistaken it is part of the 'ir.needaction_mixin' feature. You need to inherit from 'ir.needaction_mixin', then you the method _needaction_domain_get for that model that returns the domain that will be used to count the number of records.
Not many models implement this. One of the example (which you pointed out as well) is mail.message: odoo/addons/mail/mail_message.py
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|Asked: 1/28/15, 4:20 AM|
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|Last updated: 3/16/15, 8:10 AM|